diff --git a/gst-libs/gst/gl/gstglmixer.c b/gst-libs/gst/gl/gstglmixer.c
index 5f22506570..7d91f17394 100644
--- a/gst-libs/gst/gl/gstglmixer.c
+++ b/gst-libs/gst/gl/gstglmixer.c
@@ -538,6 +538,7 @@ gst_gl_mixer_query_caps (GstPad * pad, GstAggregator * agg, GstQuery * query)
     caps = gst_caps_intersect_full (filter, caps, GST_CAPS_INTERSECT_FIRST);
 
   gst_query_set_caps_result (query, caps);
+  gst_caps_unref (caps);
 
   return TRUE;
 }