diff --git a/libavfilter/vf_drawbox.c b/libavfilter/vf_drawbox.c
index d669dfb5c9..7dff875938 100644
--- a/libavfilter/vf_drawbox.c
+++ b/libavfilter/vf_drawbox.c
@@ -190,7 +190,7 @@ static int config_input(AVFilterLink *inlink)
     return 0;
 
 fail:
-    av_log(NULL, AV_LOG_ERROR,
+    av_log(ctx, AV_LOG_ERROR,
            "Error when evaluating the expression '%s'.\n",
            expr);
     return ret;