diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 70efc5cd3cc1b3c372fd5ceb93b99ada94e797a9..cffcfcadc20325f6737fe8ea07aa120cc8433dba 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -164,6 +164,7 @@ static inline void avfilter_copy_buffer_ref_props(AVFilterBufferRef *dst, AVFilt
     switch (src->type) {
     case AVMEDIA_TYPE_VIDEO: *dst->video = *src->video; break;
     case AVMEDIA_TYPE_AUDIO: *dst->audio = *src->audio; break;
+    default: break;
     }
 }