diff --git a/libavdevice/x11grab.c b/libavdevice/x11grab.c
index 48d5118b4a..46af711815 100644
--- a/libavdevice/x11grab.c
+++ b/libavdevice/x11grab.c
@@ -323,7 +323,7 @@ x11grab_read_header(AVFormatContext *s1)
     st->codec->bit_rate = x11grab->frame_size * 1/av_q2d(x11grab->time_base) * 8;
 
 out:
-    av_free(param);
+    av_free(dpyname);
     return ret;
 }