diff --git a/libavfilter/buffer.c b/libavfilter/buffer.c
index 0327952e79..43dc66911a 100644
--- a/libavfilter/buffer.c
+++ b/libavfilter/buffer.c
@@ -38,7 +38,7 @@ void ff_avfilter_default_free_buffer(AVFilterBuffer *ptr)
 {
     if (ptr->extended_data != ptr->data)
         av_freep(&ptr->extended_data);
-    av_free(ptr->data[0]);
+    av_freep(&ptr->data[0]);
     av_free(ptr);
 }