diff --git a/src/core/processing-queue.js b/src/core/processing-queue.js
index 947464536..bf23da93d 100644
--- a/src/core/processing-queue.js
+++ b/src/core/processing-queue.js
@@ -183,7 +183,7 @@ function done () {
 
   const storage = config.storage;
 
-  const runtime = performance.now() - config.started;
+  const runtime = Math.round(performance.now() - config.started);
   const passed = config.stats.all - config.stats.bad;
 
   ProcessingQueue.finished = true;
diff --git a/src/html-reporter/html.js b/src/html-reporter/html.js
index 5ddc64cfe..c2cbc4eab 100644
--- a/src/html-reporter/html.js
+++ b/src/html-reporter/html.js
@@ -756,7 +756,7 @@ export function escapeText (str) {
     let html = [
       runEnd.testCounts.total,
       ' tests completed in ',
-      Math.round(runEnd.runtime),
+      runEnd.runtime,
       ' milliseconds, with ',
       runEnd.testCounts.failed,
       ' failed, ',
@@ -779,7 +779,7 @@ export function escapeText (str) {
 
     // Update remaining tests to aborted
     if (abortButton && abortButton.disabled) {
-      html = 'Tests aborted after ' + Math.round(runEnd.runtime) + ' milliseconds.';
+      html = 'Tests aborted after ' + runEnd.runtime + ' milliseconds.';
 
       for (let i = 0; i < tests.children.length; i++) {
         test = tests.children[i];
@@ -882,7 +882,7 @@ export function escapeText (str) {
 
     let message = escapeText(details.message) || (details.result ? 'okay' : 'failed');
     message = "<span class='test-message'>" + message + '</span>';
-    message += "<span class='runtime'>@ " + Math.round(details.runtime) + ' ms</span>';
+    message += "<span class='runtime'>@ " + details.runtime + ' ms</span>';
 
     let expected;
     let actual;
@@ -1043,7 +1043,7 @@ export function escapeText (str) {
 
       let time = document.createElement('span');
       time.className = 'runtime';
-      time.innerHTML = Math.round(details.runtime) + ' ms';
+      time.innerHTML = details.runtime + ' ms';
       testItem.insertBefore(time, assertList);
     }
 
diff --git a/src/reports/suite.js b/src/reports/suite.js
index ebb2ff26a..a2b72289f 100644
--- a/src/reports/suite.js
+++ b/src/reports/suite.js
@@ -72,7 +72,7 @@ export default class SuiteReport {
   }
 
   getRuntime () {
-    return this._endTime - this._startTime;
+    return Math.round(this._endTime - this._startTime);
   }
 
   getTestCounts (counts = { passed: 0, failed: 0, skipped: 0, todo: 0, total: 0 }) {
diff --git a/src/reports/test.js b/src/reports/test.js
index aab7f28e3..980207dd6 100644
--- a/src/reports/test.js
+++ b/src/reports/test.js
@@ -61,7 +61,7 @@ export default class TestReport {
   }
 
   getRuntime () {
-    return this._endTime - this._startTime;
+    return Math.round(this._endTime - this._startTime);
   }
 
   getStatus () {
diff --git a/src/test.js b/src/test.js
index 327fd4a79..75f642a0d 100644
--- a/src/test.js
+++ b/src/test.js
@@ -371,7 +371,7 @@ Test.prototype = {
     let bad = 0;
     const storage = config.storage;
 
-    this.runtime = performance.now() - this.started;
+    this.runtime = Math.round(performance.now() - this.started);
 
     config.stats.all += this.assertions.length;
     config.stats.testCount += 1;
@@ -477,7 +477,7 @@ Test.prototype = {
         failed: module.stats.bad,
         passed: module.stats.all - module.stats.bad,
         total: module.stats.all,
-        runtime: performance.now() - module.stats.started
+        runtime: Math.round(performance.now() - module.stats.started)
       });
     }
   },
@@ -559,7 +559,7 @@ Test.prototype = {
       actual: resultInfo.actual,
       testId: this.testId,
       negative: resultInfo.negative || false,
-      runtime: performance.now() - this.started,
+      runtime: Math.round(performance.now() - this.started),
       todo: !!this.todo
     };