diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..cf33861
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,787 @@
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+      "integrity": "sha1-E1uZLAV1yYXPoPSUoyJ+0jhYPs4="
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+      "integrity": "sha1-peZUwuWi3rXyAdls77yoDA7y9RM=",
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+      "integrity": "sha1-tIDIkuWaLwWVTOcnvT8qTogvnhM="
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+      "integrity": "sha1-Epai1Y/UXxmg9s4B1lcB4sc1tus="
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+      "resolved": "https://registry.npmjs.org/jsprim/-/jsprim-1.4.1.tgz",
+      "integrity": "sha1-MT5mvB5cwG5Di8G3SZwuXFastqI=",
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+      "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.18.tgz",
+      "integrity": "sha512-lc/aahn+t4/SWV/qcmumYjymLsWfN3ELhpmVuUFjgsORruuZPVSwAQryq+HHGvO/SI2KVX26bx+En+zhM8g8hQ==",
+      "requires": {
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+    "minimatch": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
+      "integrity": "sha512-yJHVQEhyqPLUTgt9B83PXu6W3rx4MvvHvSUvToogpwoGDOUQ+yDrR0HRot+yOCdCO7u4hX3pWft6kWBBcqh0UA==",
+      "dev": true,
+      "requires": {
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+      "integrity": "sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=",
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+      "requires": {
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+    "mocha": {
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+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-5.0.5.tgz",
+      "integrity": "sha512-3MM3UjZ5p8EJrYpG7s+29HAI9G7sTzKEe4+w37Dg0QP7qL4XGsV+Q2xet2cE37AqdgN1OtYQB6Vl98YiPV3PgA==",
+      "dev": true,
+      "requires": {
+        "browser-stdout": "1.3.1",
+        "commander": "2.11.0",
+        "debug": "3.1.0",
+        "diff": "3.5.0",
+        "escape-string-regexp": "1.0.5",
+        "glob": "7.1.2",
+        "growl": "1.10.3",
+        "he": "1.1.1",
+        "mkdirp": "0.5.1",
+        "supports-color": "4.4.0"
+      },
+      "dependencies": {
+        "has-flag": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-2.0.0.tgz",
+          "integrity": "sha1-6CB68cx7MNRGzHC3NLXovhj4jVE=",
+          "dev": true
+        },
+        "supports-color": {
+          "version": "4.4.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-4.4.0.tgz",
+          "integrity": "sha512-rKC3+DyXWgK0ZLKwmRsrkyHVZAjNkfzeehuFWdGGcqGDTZFH73+RH6S/RDAAxl9GusSjZSUWYLmT9N5pzXFOXQ==",
+          "dev": true,
+          "requires": {
+            "has-flag": "2.0.0"
+          }
+        }
+      }
+    },
+    "ms": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+      "dev": true
+    },
+    "nan": {
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/nan/-/nan-2.10.0.tgz",
+      "integrity": "sha512-bAdJv7fBLhWC+/Bls0Oza+mvTaNQtP+1RyhhhvD95pgUJz6XM5IzgmxOkItJ9tkoCiplvAnXI1tNmmUD/eScyA=="
+    },
+    "ndarray": {
+      "version": "1.0.18",
+      "resolved": "https://registry.npmjs.org/ndarray/-/ndarray-1.0.18.tgz",
+      "integrity": "sha1-tg06cyJOxVXQ+qeXEeUCRI/T95M=",
+      "requires": {
+        "iota-array": "1.0.0",
+        "is-buffer": "1.1.6"
+      }
+    },
+    "ndarray-pack": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/ndarray-pack/-/ndarray-pack-1.2.1.tgz",
+      "integrity": "sha1-jK6+qqJNXs9w/4YCBjeXfajuWFo=",
+      "requires": {
+        "cwise-compiler": "1.1.3",
+        "ndarray": "1.0.18"
+      }
+    },
+    "node-bitmap": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/node-bitmap/-/node-bitmap-0.0.1.tgz",
+      "integrity": "sha1-GA6scAPgxwdhjvMTaPYvhLKmkJE="
+    },
+    "oauth-sign": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/oauth-sign/-/oauth-sign-0.8.2.tgz",
+      "integrity": "sha1-Rqarfwrq2N6unsBWV4C31O/rnUM="
+    },
+    "omggif": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/omggif/-/omggif-1.0.9.tgz",
+      "integrity": "sha1-3LcCTazVDFK00wPwSALJHAV8dl8="
+    },
+    "once": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/once/-/once-1.4.0.tgz",
+      "integrity": "sha1-WDsap3WWHUsROsF9nFC6753Xa9E=",
+      "dev": true,
+      "requires": {
+        "wrappy": "1.0.2"
+      }
+    },
+    "parse-data-uri": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/parse-data-uri/-/parse-data-uri-0.2.0.tgz",
+      "integrity": "sha1-vwTYUd1ch7CrI45dAazklLYEtMk=",
+      "requires": {
+        "data-uri-to-buffer": "0.0.3"
+      }
+    },
+    "path-is-absolute": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
+      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
+      "dev": true
+    },
+    "pathval": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/pathval/-/pathval-1.1.0.tgz",
+      "integrity": "sha1-uULm1L3mUwBe9rcTYd74cn0GReA="
+    },
+    "performance-now": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
+      "integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns="
+    },
+    "pngjs": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-2.3.1.tgz",
+      "integrity": "sha1-EdHhK5y2TWPjDBQ6Mw9MH1Z9qF8="
+    },
+    "pngjs2": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/pngjs2/-/pngjs2-2.0.0.tgz",
+      "integrity": "sha1-3h08m9ZVZFN16MUBYV92mDCbWNs="
+    },
+    "punycode": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.4.1.tgz",
+      "integrity": "sha1-wNWmOycYgArY4esPpSachN1BhF4="
+    },
+    "qs": {
+      "version": "6.5.1",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.1.tgz",
+      "integrity": "sha512-eRzhrN1WSINYCDCbrz796z37LOe3m5tmW7RQf6oBntukAG1nmovJvhnwHHRMAfeoItc1m2Hk02WER2aQ/iqs+A=="
+    },
+    "request": {
+      "version": "2.85.0",
+      "resolved": "https://registry.npmjs.org/request/-/request-2.85.0.tgz",
+      "integrity": "sha512-8H7Ehijd4js+s6wuVPLjwORxD4zeuyjYugprdOXlPSqaApmL/QOy+EB/beICHVCHkGMKNh5rvihb5ov+IDw4mg==",
+      "requires": {
+        "aws-sign2": "0.7.0",
+        "aws4": "1.6.0",
+        "caseless": "0.12.0",
+        "combined-stream": "1.0.6",
+        "extend": "3.0.1",
+        "forever-agent": "0.6.1",
+        "form-data": "2.3.2",
+        "har-validator": "5.0.3",
+        "hawk": "6.0.2",
+        "http-signature": "1.2.0",
+        "is-typedarray": "1.0.0",
+        "isstream": "0.1.2",
+        "json-stringify-safe": "5.0.1",
+        "mime-types": "2.1.18",
+        "oauth-sign": "0.8.2",
+        "performance-now": "2.1.0",
+        "qs": "6.5.1",
+        "safe-buffer": "5.1.1",
+        "stringstream": "0.0.5",
+        "tough-cookie": "2.3.4",
+        "tunnel-agent": "0.6.0",
+        "uuid": "3.2.1"
+      }
+    },
+    "safe-buffer": {
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.1.tgz",
+      "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg=="
+    },
+    "sntp": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/sntp/-/sntp-2.1.0.tgz",
+      "integrity": "sha512-FL1b58BDrqS3A11lJ0zEdnJ3UOKqVxawAkF3k7F0CVN7VQ34aZrV+G8BZ1WC9ZL7NyrwsW0oviwsWDgRuVYtJg==",
+      "requires": {
+        "hoek": "4.2.1"
+      }
+    },
+    "sshpk": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/sshpk/-/sshpk-1.14.1.tgz",
+      "integrity": "sha1-Ew9Zde3a2WPx1W+SuaxsUfqfg+s=",
+      "requires": {
+        "asn1": "0.2.3",
+        "assert-plus": "1.0.0",
+        "bcrypt-pbkdf": "1.0.1",
+        "dashdash": "1.14.1",
+        "ecc-jsbn": "0.1.1",
+        "getpass": "0.1.7",
+        "jsbn": "0.1.1",
+        "tweetnacl": "0.14.5"
+      }
+    },
+    "stringstream": {
+      "version": "0.0.5",
+      "resolved": "https://registry.npmjs.org/stringstream/-/stringstream-0.0.5.tgz",
+      "integrity": "sha1-TkhM1N5aC7vuGORjB3EKioFiGHg="
+    },
+    "supports-color": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.3.0.tgz",
+      "integrity": "sha512-0aP01LLIskjKs3lq52EC0aGBAJhLq7B2Rd8HC/DR/PtNNpcLilNmHC12O+hu0usQpo7wtHNRqtrhBwtDb0+dNg==",
+      "dev": true,
+      "requires": {
+        "has-flag": "3.0.0"
+      }
+    },
+    "through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU="
+    },
+    "tough-cookie": {
+      "version": "2.3.4",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-2.3.4.tgz",
+      "integrity": "sha512-TZ6TTfI5NtZnuyy/Kecv+CnoROnyXn2DN97LontgQpCwsX2XyLYCC0ENhYkehSOwAp8rTQKc/NUIF7BkQ5rKLA==",
+      "requires": {
+        "punycode": "1.4.1"
+      }
+    },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "requires": {
+        "safe-buffer": "5.1.1"
+      }
+    },
+    "tweetnacl": {
+      "version": "0.14.5",
+      "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
+      "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=",
+      "optional": true
+    },
+    "type-detect": {
+      "version": "4.0.8",
+      "resolved": "https://registry.npmjs.org/type-detect/-/type-detect-4.0.8.tgz",
+      "integrity": "sha512-0fr/mIH1dlO+x7TlcMy+bIDqKPsw/70tVyeHW787goQjhmqaZe10uwLujubK9q9Lg6Fiho1KUKDYz0Z7k7g5/g=="
+    },
+    "uniq": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/uniq/-/uniq-1.0.1.tgz",
+      "integrity": "sha1-sxxa6CVIRKOoKBVBzisEuGWnNP8="
+    },
+    "uuid": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.2.1.tgz",
+      "integrity": "sha512-jZnMwlb9Iku/O3smGWvZhauCf6cvvpKi4BKRiliS3cxnI+Gz9j5MEpTz2UFuXiKPJocb7gnsLHwiS05ige5BEA=="
+    },
+    "verror": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/verror/-/verror-1.10.0.tgz",
+      "integrity": "sha1-OhBcoXBTr1XW4nDB+CiGguGNpAA=",
+      "requires": {
+        "assert-plus": "1.0.0",
+        "core-util-is": "1.0.2",
+        "extsprintf": "1.3.0"
+      }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
index 9f298b5..bea2d4a 100644
--- a/package.json
+++ b/package.json
@@ -40,18 +40,17 @@
     "install": "node-gyp rebuild --msvs_version=auto",
     "clean": "rm -rf build node_modules",
     "lint": "eslint lib test",
-    "test": "mocha test"
+    "test": "mocha -gc test"
   },
   "dependencies": {
-    "bindings": ">=1.2.1",
-    "chai": ">=2.0.0",
-    "get-pixels": ">=3.1.1",
-    "memwatch-next": "^0.2.10",
-    "nan": "^2.8.0",
-    "pngjs2": "*"
+    "bindings": "^1.2.1",
+    "nan": "^2.8.0"
   },
   "devDependencies": {
     "chalk": ">=0.5.1",
+    "chai": ">=2.0.0",
+    "get-pixels": ">=3.1.1",
+    "memwatch-next": "^0.2.10",
     "mocha": "*"
   },
   "gypfile": true,
diff --git a/src/event.cpp b/src/event.cpp
index 6833e5f..dd7475d 100644
--- a/src/event.cpp
+++ b/src/event.cpp
@@ -192,9 +192,16 @@ class NoCLEventWorker : public AsyncWorker
   {
     SaveToPersistent(kIndex,  userData);
     SaveToPersistent(kIndex+1,noCLEvent);
+    this->async = new uv_async_t;
+    this->async->data = (void*) this;
+    uv_async_init(uv_default_loop(), this->async, (uv_async_cb) dispatched_async_uv_callback);
   }
 
-  ~NoCLEventWorker() {}
+  ~NoCLEventWorker() {
+    uv_close((uv_handle_t*)this->async, &delete_async_handle);
+  }
+
+  uv_async_t *async;
 
   void CallBackIsDone(int status) {
     mCLCallbackStatus = status;
@@ -210,27 +217,42 @@ class NoCLEventWorker : public AsyncWorker
   // this function will be run inside the main event loop
   // so it is safe to use V8 again
   void HandleOKCallback () {
-    Nan::EscapableHandleScope  scope;
+    Nan::HandleScope scope;
 
     Local<Value> argv[] = {
       GetFromPersistent(kIndex),  // event
       JS_INT(mCLCallbackStatus),  // error status
       GetFromPersistent(kIndex+1) // userdata
     };
-    callback->Call(3,argv);
+    callback->Call(3, argv, async_resource);
   }
 
 protected:
   static const uint32_t kIndex = 0;
+  static void delete_async_handle(uv_handle_t *handle);
+  // The callback invoked by the call to uv_async_send() in notifyCB.
+  // Invoked on the main thread, so it's safe to call AsyncQueueWorker.
+  static void dispatched_async_uv_callback(uv_async_t*);
 
- private:
-   int mCLCallbackStatus = 0;
+private:
+  int mCLCallbackStatus = 0;
 };
 
+void NoCLEventWorker::delete_async_handle(uv_handle_t *handle) {
+  delete (uv_async_t *) handle;
+}
+
+void NoCLEventWorker::dispatched_async_uv_callback(uv_async_t *req) {
+  NoCLEventWorker* asyncCB = static_cast<NoCLEventWorker*>(req->data);
+  AsyncQueueWorker(asyncCB);
+}
+
+// callback invoked off the main thread by clSetEventCallback
 void CL_CALLBACK notifyCB (cl_event event, cl_int event_command_exec_status, void *user_data) {
   NoCLEventWorker* asyncCB = static_cast<NoCLEventWorker*>(user_data);
   asyncCB->CallBackIsDone(event_command_exec_status);
-  AsyncQueueWorker(asyncCB);
+  // send a message to the main thread to safely invoke the JS callback
+  uv_async_send(asyncCB->async);
 }
 
 NAN_METHOD(SetEventCallback)
diff --git a/test/test_leak1.js b/test/test_leak1.js
index 7295c49..bc54129 100644
--- a/test/test_leak1.js
+++ b/test/test_leak1.js
@@ -18,12 +18,12 @@ var platform=cl.getPlatformIDs()[0];
 var properties=[cl.CONTEXT_PLATFORM, platform];
 var ctx;
 if (cl.createContextFromType !== undefined) {
-  ctx = cl.createContextFromType(properties, cl.DEVICE_TYPE_CPU, null, null);
+  ctx = cl.createContextFromType(properties, cl.DEVICE_TYPE_GPU, null, null);
 }
 else {
   ctx = cl.createContext(
     properties,
-    cl.getDeviceIDs(platform, cl.DEVICE_TYPE_CPU));
+    cl.getDeviceIDs(platform, cl.DEVICE_TYPE_GPU));
 }
 
 memwatch.gc();