diff --git a/gtk/gtkstyleproperty.c b/gtk/gtkstyleproperty.c
index ce2f4e1faf..17415eb77d 100644
--- a/gtk/gtkstyleproperty.c
+++ b/gtk/gtkstyleproperty.c
@@ -2064,6 +2064,11 @@ gtk_style_property_init (void)
                                           NULL,
                                           NULL);
 
+  gtk_style_properties_register_property (NULL,
+                                          g_param_spec_boxed ("box-shadow",
+                                                              "Box shadow",
+                                                              "Box shadow",
+                                                              GTK_TYPE_SHADOW, 0));
   gtk_style_properties_register_property (NULL,
                                           g_param_spec_int ("margin-top",
                                                             "margin top",