diff --git a/libgimpconfig/gimpconfig-params.c b/libgimpconfig/gimpconfig-params.c
index b2525cd7b0..12d97bd5ad 100644
--- a/libgimpconfig/gimpconfig-params.c
+++ b/libgimpconfig/gimpconfig-params.c
@@ -351,6 +351,7 @@ gimp_config_param_spec_duplicate (GParamSpec *pspec)
            * with type names instead.
            */
           g_strcmp0 (type_name, "GimpImage")     == 0 ||
+          g_strcmp0 (type_name, "GimpDisplay")   == 0 ||
           g_strcmp0 (type_name, "GimpDrawable")  == 0 ||
           g_strcmp0 (type_name, "GimpLayer")     == 0 ||
           g_strcmp0 (type_name, "GimpTextLayer") == 0 ||