diff --git a/src/ctl/ctl-sink.c b/src/ctl/ctl-sink.c
index a613434..bb592b3 100644
--- a/src/ctl/ctl-sink.c
+++ b/src/ctl/ctl-sink.c
@@ -98,12 +98,13 @@ static void sink_handle_get_parameter(struct ctl_sink *s,
             }
         }
         if (wfd_video_formats == NULL) {
-            char video_formats[128];
+            gchar video_formats[128];
             sprintf(video_formats, "00 00 03 10 %08x %08x %08x 00 0000 0000 10 none none",
                     s->resolutions_cea, s->resolutions_vesa, s->resolutions_hh);
-	    wfd_video_formats = video_formats;
+	    wfd_video_formats = strdup(video_formats);
         }
         check_and_response_option(WFD_VIDEO_FORMATS, wfd_video_formats);
+        g_free(wfd_video_formats);
 
 	/* wfd_audio_codecs */
         gchar* wfd_audio_codecs = "AAC 00000007 00";