diff --git a/src/audio/SDL_audio.c b/src/audio/SDL_audio.c
index a9d77d5ca..6bbac3433 100644
--- a/src/audio/SDL_audio.c
+++ b/src/audio/SDL_audio.c
@@ -423,7 +423,7 @@ int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained)
 		return(-1);
 	}
 
-#if defined(macintosh) || (defined(__riscos__) && !defined(DISABLE_THREADS))
+#if defined(macintosh) || (defined(__riscos__) && defined(DISABLE_THREADS))
 	/* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */
 #else
 #if defined(__MINT__) && !defined(ENABLE_THREADS)