diff --git a/libavfilter/vf_colormatrix.c b/libavfilter/vf_colormatrix.c
index ff7b9e0040..571b9d4597 100644
--- a/libavfilter/vf_colormatrix.c
+++ b/libavfilter/vf_colormatrix.c
@@ -353,6 +353,7 @@ static int filter_frame(AVFilterLink *link, AVFilterBufferRef *in)
     else
         process_frame_uyvy422(color, out, in);
 
+    avfilter_unref_bufferp(&in);
     return ff_filter_frame(outlink, out);
 }