diff --git a/libavformat/nut.h b/libavformat/nut.h
index d8686524b2..323d549ac1 100644
--- a/libavformat/nut.h
+++ b/libavformat/nut.h
@@ -99,4 +99,4 @@ static unsigned long av_crc04C11DB7_update(unsigned long checksum, const uint8_t
     return av_crc(av_crc04C11DB7, checksum, buf, len);
 }
 
-#endif AVFORMAT_NUT_H
+#endif /* AVFORMAT_NUT_H */