diff --git a/gst/videotestsrc/gstvideotestsrc.c b/gst/videotestsrc/gstvideotestsrc.c
index 7a7ccc750..f06f25221 100644
--- a/gst/videotestsrc/gstvideotestsrc.c
+++ b/gst/videotestsrc/gstvideotestsrc.c
@@ -472,6 +472,7 @@ gst_video_test_src_src_fixate (GstBaseSrc * bsrc, GstCaps * caps)
     } else {
       gst_caps_replace (&caps, alpha_only_caps);
     }
+    gst_caps_unref (alpha_only_caps);
   }
 
   caps = gst_caps_make_writable (caps);