diff --git a/.gitignore b/.gitignore
index 29460701..09b89f9c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,4 @@
 *.sw?
 *.db
 *.tmp
-generated_*.go
+vendor
diff --git a/.travis.yml b/.travis.yml
index 48bb72ba..658653bf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -39,6 +39,7 @@ install:
   - export TRAVIS_BUILD_DIR=$GOPATH/src/upper.io/db.v3
   - mv $PWD $TRAVIS_BUILD_DIR
   - cd $TRAVIS_BUILD_DIR
+  - if [ ! -z "$(go version | grep go1.12)" ]; then export GO111MODULE=on; fi
   - go get -t -v -d ./...
   - go get -v modernc.org/ql/ql
 
diff --git a/go.mod b/go.mod
new file mode 100644
index 00000000..4fe8938b
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module upper.io/db.v3
+
+go 1.12