diff --git a/lib/reporters/json-stream.js b/lib/reporters/json-stream.js
index 8caa8adfce..87cf607282 100644
--- a/lib/reporters/json-stream.js
+++ b/lib/reporters/json-stream.js
@@ -84,7 +84,8 @@ function clean(test) {
     fullTitle: test.fullTitle(),
     file: test.file,
     duration: test.duration,
-    currentRetry: test.currentRetry()
+    currentRetry: test.currentRetry(),
+    speed: test.speed
   };
 }
 
diff --git a/lib/reporters/json.js b/lib/reporters/json.js
index a46776ba9c..a314cd3805 100644
--- a/lib/reporters/json.js
+++ b/lib/reporters/json.js
@@ -90,6 +90,7 @@ function clean(test) {
     file: test.file,
     duration: test.duration,
     currentRetry: test.currentRetry(),
+    speed: test.speed,
     err: cleanCycles(err)
   };
 }
diff --git a/test/reporters/json-stream.spec.js b/test/reporters/json-stream.spec.js
index 613b9279f8..58694e3f19 100644
--- a/test/reporters/json-stream.spec.js
+++ b/test/reporters/json-stream.spec.js
@@ -23,12 +23,14 @@ describe('JSON Stream reporter', function() {
   var expectedFile = 'someTest.spec.js';
   var expectedDuration = 1000;
   var currentRetry = 1;
+  var expectedSpeed = 'fast';
   var expectedTest = makeExpectedTest(
     expectedTitle,
     expectedFullTitle,
     expectedFile,
     expectedDuration,
-    currentRetry
+    currentRetry,
+    expectedSpeed
   );
   var expectedErrorMessage = 'error message';
   var expectedErrorStack = 'error stack';
@@ -78,6 +80,8 @@ describe('JSON Stream reporter', function() {
             expectedDuration +
             ',"currentRetry":' +
             currentRetry +
+            ',"speed":' +
+            dQuote(expectedSpeed) +
             '}]\n'
         );
       });
@@ -111,6 +115,8 @@ describe('JSON Stream reporter', function() {
               expectedDuration +
               ',"currentRetry":' +
               currentRetry +
+              ',"speed":' +
+              dQuote(expectedSpeed) +
               ',"err":' +
               dQuote(expectedErrorMessage) +
               ',"stack":' +
@@ -147,6 +153,8 @@ describe('JSON Stream reporter', function() {
               expectedDuration +
               ',"currentRetry":' +
               currentRetry +
+              ',"speed":' +
+              dQuote(expectedSpeed) +
               ',"err":' +
               dQuote(expectedErrorMessage) +
               ',"stack":null}]\n'
diff --git a/test/reporters/json.spec.js b/test/reporters/json.spec.js
index a92be62273..3eca1e9175 100644
--- a/test/reporters/json.spec.js
+++ b/test/reporters/json.spec.js
@@ -84,6 +84,29 @@ describe('JSON reporter', function() {
     });
   });
 
+  it('should have 1 test pass', function(done) {
+    const test = new Test(testTitle, () => {});
+
+    test.file = testFile;
+    suite.addTest(test);
+
+    runner.run(function(failureCount) {
+      expect(runner, 'to satisfy', {
+        testResults: {
+          passes: [
+            {
+              title: testTitle,
+              file: testFile,
+              speed: /(slow|medium|fast)/
+            }
+          ]
+        }
+      });
+      expect(failureCount, 'to be', 0);
+      done();
+    });
+  });
+
   it('should handle circular objects in errors', function(done) {
     var testTitle = 'json test 1';
     function CircleError() {