diff --git a/modules/benchpress/src/webdriver/chrome_driver_extension.js b/modules/benchpress/src/webdriver/chrome_driver_extension.js
index ec9174d4fc..b614035d20 100644
--- a/modules/benchpress/src/webdriver/chrome_driver_extension.js
+++ b/modules/benchpress/src/webdriver/chrome_driver_extension.js
@@ -116,7 +116,11 @@ function normalizeEvent(chromeEvent, data) {
     'ts': chromeEvent['ts'] / 1000
   };
   if (chromeEvent['ph'] === 'X') {
-    result['dur'] = chromeEvent['dur'] / 1000;
+    var dur = chromeEvent['dur'];
+    if (isBlank(dur)) {
+      dur = chromeEvent['tdur'];
+    }
+    result['dur'] = isBlank(dur) ? 0.0 : dur / 1000;
   }
   StringMapWrapper.forEach(data, (value, prop) => {
     result[prop] = value;
diff --git a/modules/benchpress/test/webdriver/chrome_driver_extension_spec.js b/modules/benchpress/test/webdriver/chrome_driver_extension_spec.js
index adcece7389..16272d87dc 100644
--- a/modules/benchpress/test/webdriver/chrome_driver_extension_spec.js
+++ b/modules/benchpress/test/webdriver/chrome_driver_extension_spec.js
@@ -83,6 +83,17 @@ export function main() {
         });
       });
 
+      it('should normalize "tdur" to "dur"', (done) => {
+        var event = chromeTimelineEvents.create('X', 'FunctionCall', 1100, null);
+        event['tdur'] = 5500;
+        createExtension([event]).readPerfLog().then( (events) => {
+          expect(events).toEqual([
+            normEvents.complete('script', 1.1, 5.5, null),
+          ]);
+          done();
+        });
+      });
+
       it('should report FunctionCall events as "script"', (done) => {
         createExtension([
           chromeTimelineEvents.start('FunctionCall', 0)