diff --git a/doc/examples/decode_filter_audio.c b/doc/examples/decode_filter_audio.c
index 03e13ef66f..67c8a14aab 100644
--- a/doc/examples/decode_filter_audio.c
+++ b/doc/examples/decode_filter_audio.c
@@ -30,8 +30,6 @@
  * file to be played with ffplay.
  */
 
-#include <unistd.h>
-
 #include <libavcodec/avcodec.h>
 #include <libavformat/avformat.h>
 #include <libavfilter/buffersink.h>