diff --git a/libavfilter/vf_idet.c b/libavfilter/vf_idet.c
index 82f0ae1ba4..bcc2fff3ec 100644
--- a/libavfilter/vf_idet.c
+++ b/libavfilter/vf_idet.c
@@ -27,9 +27,6 @@
 #include "avfilter.h"
 #include "internal.h"
 
-#undef NDEBUG
-#include <assert.h>
-
 #define HIST_SIZE 4
 
 typedef enum {