diff --git a/stepmania/src/arch/LowLevelWindow/LowLevelWindow_Null.h b/stepmania/src/arch/LowLevelWindow/LowLevelWindow_Null.h
index de83a11580..afb3299ef0 100644
--- a/stepmania/src/arch/LowLevelWindow/LowLevelWindow_Null.h
+++ b/stepmania/src/arch/LowLevelWindow/LowLevelWindow_Null.h
@@ -1,5 +1,5 @@
-#ifndef LOW_LEVEL_WINDOW_SDL_H
-#define LOW_LEVEL_WINDOW_SDL_H
+#ifndef LOW_LEVEL_WINDOW_NULL_H
+#define LOW_LEVEL_WINDOW_NULL_H
 
 #include "LowLevelWindow.h"