diff --git a/toolkit/components/passwordmgr/test/browser/browser_passwordmgr_sort.js b/toolkit/components/passwordmgr/test/browser/browser_passwordmgr_sort.js
index f72c8159305..0e9efc3208b 100644
--- a/toolkit/components/passwordmgr/test/browser/browser_passwordmgr_sort.js
+++ b/toolkit/components/passwordmgr/test/browser/browser_passwordmgr_sort.js
@@ -114,7 +114,7 @@ function test() {
                     else if (aTopic == "domwindowopened") {
                         let win = aSubject.QueryInterface(Ci.nsIDOMEventTarget);
                         SimpleTest.waitForFocus(function() {
-                            EventUtils.synthesizeKey("VK_RETURN", {}, win)
+                            EventUtils.sendKey("RETURN", win);
                         }, win);
                     }
                 });
diff --git a/toolkit/components/passwordmgr/test/browser/browser_passwordmgrdlg.js b/toolkit/components/passwordmgr/test/browser/browser_passwordmgrdlg.js
index 3a23d618acc..6f91712a46e 100644
--- a/toolkit/components/passwordmgr/test/browser/browser_passwordmgrdlg.js
+++ b/toolkit/components/passwordmgr/test/browser/browser_passwordmgrdlg.js
@@ -124,7 +124,7 @@ function test() {
                     else if (aTopic == "domwindowopened") {
                         let win = aSubject.QueryInterface(Ci.nsIDOMEventTarget);
                         SimpleTest.waitForFocus(function() {
-                            EventUtils.synthesizeKey("VK_RETURN", {}, win)
+                            EventUtils.sendKey("RETURN", win);
                         }, win);
                     }
                 });