diff --git a/gst/videomixer/videomixer2.c b/gst/videomixer/videomixer2.c
index 15659862d4..25fc35ae3a 100644
--- a/gst/videomixer/videomixer2.c
+++ b/gst/videomixer/videomixer2.c
@@ -801,9 +801,9 @@ gst_videomixer2_update_qos (GstVideoMixer2 * mix, gdouble proportion,
     GstClockTimeDiff diff, GstClockTime timestamp)
 {
   GST_DEBUG_OBJECT (mix,
-      "Updating QoS: proportion %lf, diff %s%" GST_TIME_FORMAT ", timestamp %"
-      GST_TIME_FORMAT, proportion, (diff < 0) ? "-" : "",
-      GST_TIME_ARGS (ABS (diff)), GST_TIME_ARGS (timestamp));
+      "Updating QoS: proportion %lf, diff %" GST_STIME_FORMAT ", timestamp %"
+      GST_TIME_FORMAT, proportion, GST_STIME_ARGS (diff),
+      GST_TIME_ARGS (timestamp));
 
   GST_OBJECT_LOCK (mix);
   mix->proportion = proportion;