diff --git a/gtk/gtkconstraintguide.c b/gtk/gtkconstraintguide.c
index 3159e905ee..de7bb03499 100644
--- a/gtk/gtkconstraintguide.c
+++ b/gtk/gtkconstraintguide.c
@@ -307,7 +307,7 @@ gtk_constraint_guide_get_property (GObject    *gobject,
       break;
 
     case PROP_STRENGTH:
-      g_value_set_int (value, self->strength);
+      g_value_set_enum (value, self->strength);
       break;
 
     case PROP_NAME: