diff --git a/libavfilter/vf_libopencv.c b/libavfilter/vf_libopencv.c
index f55f552ec5..16de98ec87 100644
--- a/libavfilter/vf_libopencv.c
+++ b/libavfilter/vf_libopencv.c
@@ -348,7 +348,7 @@ static av_cold void uninit(AVFilterContext *ctx)
 
     if (s->uninit)
         s->uninit(ctx);
-    av_free(s->priv);
+    av_freep(&s->priv);
 }
 
 static int filter_frame(AVFilterLink *inlink, AVFrame *in)