diff --git a/CHANGELOG.md b/CHANGELOG.md
index e49c8353a..8274b958d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,10 @@ Please see [CONTRIBUTING.md](https://github.com/cucumber/cucumber/blob/master/CO
 * add `--require-module` to require node modules before support code is loaded
 * add snippet interface "async-await"
 
+#### Bug Fixes
+
+* revert json formatter duration to nanoseconds
+
 #### Deprecations
 
 * `defineSupportCode` is deprecated. Require/import the individual methods instead
diff --git a/src/formatter/json_formatter.js b/src/formatter/json_formatter.js
index 28d5c8c0c..d04825c70 100644
--- a/src/formatter/json_formatter.js
+++ b/src/formatter/json_formatter.js
@@ -145,7 +145,7 @@ export default class JsonFormatter extends Formatter {
       const { result: { exception, status } } = testStep
       data.result = { status }
       if (testStep.result.duration) {
-        data.result.duration = testStep.result.duration
+        data.result.duration = testStep.result.duration * 1000000
       }
       if (status === Status.FAILED && exception) {
         data.result.error_message = format(exception)
diff --git a/src/formatter/json_formatter_spec.js b/src/formatter/json_formatter_spec.js
index 2f7cd06f0..602cc6cba 100644
--- a/src/formatter/json_formatter_spec.js
+++ b/src/formatter/json_formatter_spec.js
@@ -94,7 +94,7 @@ describe('JsonFormatter', function() {
                     name: 'my step',
                     result: {
                       status: 'passed',
-                      duration: 1
+                      duration: 1000000
                     }
                   }
                 ],
@@ -139,7 +139,7 @@ describe('JsonFormatter', function() {
         expect(features[0].elements[0].steps[0].result).to.eql({
           status: 'failed',
           error_message: 'my error',
-          duration: 1
+          duration: 1000000
         })
       })
     })