diff --git a/libavformat/mux.c b/libavformat/mux.c
index adf817112e..050c4d9411 100644
--- a/libavformat/mux.c
+++ b/libavformat/mux.c
@@ -44,9 +44,6 @@
 #include "network.h"
 #endif
 
-#undef NDEBUG
-#include <assert.h>
-
 /**
  * @file
  * muxing functions for use within libavformat