diff --git a/validate/gst/validate/gst-validate-override-registry.c b/validate/gst/validate/gst-validate-override-registry.c
index b68a47f953..828823d072 100644
--- a/validate/gst/validate/gst-validate-override-registry.c
+++ b/validate/gst/validate/gst-validate-override-registry.c
@@ -104,6 +104,7 @@ gst_validate_overide_registery_free (GstValidateOverrideRegistry * reg)
   g_queue_clear (&reg->name_overrides);
   g_queue_clear (&reg->gtype_overrides);
   g_queue_clear (&reg->klass_overrides);
+  g_mutex_clear (&reg->mutex);
 
   g_slice_free (GstValidateOverrideRegistry, reg);
 }