diff --git a/stepmania/src/arch/InputHandler/InputHandler_SDL.cpp b/stepmania/src/arch/InputHandler/InputHandler_SDL.cpp
index a9b59b8fb3..960cd3a56e 100644
--- a/stepmania/src/arch/InputHandler/InputHandler_SDL.cpp
+++ b/stepmania/src/arch/InputHandler/InputHandler_SDL.cpp
@@ -49,7 +49,7 @@ static RageKeySym SDLSymToKeySym( SDLKey key )
 	};
 
 	/* 0...127: */
-	if( key < ARRAYSIZE(ASCIIKeySyms) )
+	if( key < int(ARRAYSIZE(ASCIIKeySyms)) )
 		return ASCIIKeySyms[key];
 
 	/* SDLK_WORLD_0 ... SDLK_WORLD_95 to KEY_OTHER_0 ... KEY_OTHER_0 + 95 */