diff --git a/libavformat/ipmovie.c b/libavformat/ipmovie.c
index 2b0d955df965dbedddc53b37911be3c98c8aca13..c248bff969eb4c8b1c603aceb2c2f78ba5b5e9f0 100644
--- a/libavformat/ipmovie.c
+++ b/libavformat/ipmovie.c
@@ -40,6 +40,7 @@
 #define DEBUG_IPMOVIE 0
 
 #if DEBUG_IPMOVIE
+#undef printf
 #define debug_ipmovie printf
 #else
 static inline void debug_ipmovie(const char *format, ...) { }