diff --git a/ext/gl/gstgltestsrc.c b/ext/gl/gstgltestsrc.c
index 116090ac95..1148a44d4f 100644
--- a/ext/gl/gstgltestsrc.c
+++ b/ext/gl/gstgltestsrc.c
@@ -300,4 +300,5 @@ gst_gl_test_src_gl_stop (GstGLBaseSrc * bsrc)
   if (src->src_impl)
     src->src_funcs->free (src->src_impl);
   src->src_impl = NULL;
+  src->src_funcs = NULL;
 }