diff --git a/aegisub/config/config_unix.h b/aegisub/config/config_unix.h
index c5dbbed6f..69a55ff24 100644
--- a/aegisub/config/config_unix.h
+++ b/aegisub/config/config_unix.h
@@ -18,14 +18,6 @@
 
 #include <stdwx.h>
 
-#ifdef WITH_FFMPEGSOURCE
-/* FIXME: For FFMPEGSource2, this needs to be fixed but should be
-          harmless for the rest of aegisub. */
-#define _snprintf snprintf
-#define _ftelli64 ftello
-#define _fseeki64 fseeko
-#endif
-
 // These shouldn't be needed any longer, if there are
 // any occurrences of __int64 replace them with long long.
 //typedef int64_t __int64;