diff --git a/dom/events/EventNameList.h b/dom/events/EventNameList.h
index 7651fb75a740..1da280e27fc8 100644
--- a/dom/events/EventNameList.h
+++ b/dom/events/EventNameList.h
@@ -821,7 +821,7 @@ NON_IDL_EVENT(gamepadbuttondown,
               EventNameType_None,
               eBasicEventClass)
 NON_IDL_EVENT(gamepadbuttonup,
-              NS_GAMEPAD_BUTTONUP,
+              eGamepadButtonUp,
               EventNameType_None,
               eBasicEventClass)
 NON_IDL_EVENT(gamepadaxismove,
diff --git a/widget/EventMessageList.h b/widget/EventMessageList.h
index 1be9538c23f4..721e5982e817 100644
--- a/widget/EventMessageList.h
+++ b/widget/EventMessageList.h
@@ -416,7 +416,7 @@ NS_EVENT_MESSAGE(NS_SPEAKERMANAGER_SPEAKERFORCEDCHANGE, NS_SPEAKERMANAGER_EVENT_
 // Gamepad input events
 NS_EVENT_MESSAGE(NS_GAMEPAD_START,        6000)
 NS_EVENT_MESSAGE(eGamepadButtonDown,     NS_GAMEPAD_START)
-NS_EVENT_MESSAGE(NS_GAMEPAD_BUTTONUP,     NS_GAMEPAD_START + 1)
+NS_EVENT_MESSAGE(eGamepadButtonUp,       NS_GAMEPAD_START + 1)
 NS_EVENT_MESSAGE(NS_GAMEPAD_AXISMOVE,     NS_GAMEPAD_START + 2)
 NS_EVENT_MESSAGE(eGamepadConnected,      NS_GAMEPAD_START + 3)
 NS_EVENT_MESSAGE(eGamepadDisconnected,   NS_GAMEPAD_START + 4)