diff --git a/stepmania/src/InputFilter.h b/stepmania/src/InputFilter.h
index 8a9c985acf..5b694a4ab6 100644
--- a/stepmania/src/InputFilter.h
+++ b/stepmania/src/InputFilter.h
@@ -17,6 +17,9 @@ enum InputEventType
 	/* The device is no longer pressed.  Exactly one IET_RELEASE event will be sent
 	 * for each IET_FIRST_PRESS. */
 	IET_RELEASE,
+
+	NUM_InputEventType,
+	InputEventType_Invalid
 };
 
 struct InputEvent