diff --git a/libavfilter/vf_pad.c b/libavfilter/vf_pad.c
index ed155578e1..186d3f028d 100644
--- a/libavfilter/vf_pad.c
+++ b/libavfilter/vf_pad.c
@@ -210,7 +210,7 @@ static int config_input(AVFilterLink *inlink)
     return 0;
 
 eval_fail:
-    av_log(NULL, AV_LOG_ERROR,
+    av_log(ctx, AV_LOG_ERROR,
            "Error when evaluating the expression '%s'\n", expr);
     return ret;