diff --git a/stepmania/src/ffmpeg/include/ffmpeg/common.h b/stepmania/src/ffmpeg/include/ffmpeg/common.h
index c1b1d47485..11d611819c 100644
--- a/stepmania/src/ffmpeg/include/ffmpeg/common.h
+++ b/stepmania/src/ffmpeg/include/ffmpeg/common.h
@@ -107,7 +107,9 @@ typedef signed __int64 int64_t;
 #    endif /* __MINGW32__ */
 
 #    ifdef _DEBUG
-#        define DEBUG
+#		ifndef DEBUG
+#			define DEBUG
+#		endif
 #    endif
 
 #    define snprintf _snprintf