diff --git a/gobject/gobject.h b/gobject/gobject.h
index 096ba7fa0..b9335a685 100644
--- a/gobject/gobject.h
+++ b/gobject/gobject.h
@@ -627,7 +627,7 @@ G_STMT_START { \
   GObject *_glib__object = (GObject*) (object); \
   GParamSpec *_glib__pspec = (GParamSpec*) (pspec); \
   guint _glib__property_id = (property_id); \
-  g_warning ("%s:%u: invalid %s id %u for \"%s\" of type '%s' in '%s'", \
+  g_warning ("%s:%d: invalid %s id %u for \"%s\" of type '%s' in '%s'", \
              __FILE__, __LINE__, \
              (pname), \
              _glib__property_id, \