diff --git a/browser/components/sessionstore/test/browser_formdata_format.js b/browser/components/sessionstore/test/browser_formdata_format.js
index 52d165a1c58f..231b2a266f68 100644
--- a/browser/components/sessionstore/test/browser_formdata_format.js
+++ b/browser/components/sessionstore/test/browser_formdata_format.js
@@ -105,7 +105,7 @@ function testTabRestoreData(aFormData, aExpectedValue, aCallback) {
       // force a change event to recollect the formdata
       let changeEvent = document.createEvent("Events");
       changeEvent.initEvent("change", true, true);
-      input.dispatchEvent(changeEvent);
+      input1.dispatchEvent(changeEvent);
     };
 
     waitForTabState(tab, tabState, tabStateCallback);