diff --git a/gtk/gtkgizmo.c b/gtk/gtkgizmo.c
index 00162645b3..45b23b20eb 100644
--- a/gtk/gtkgizmo.c
+++ b/gtk/gtkgizmo.c
@@ -82,6 +82,16 @@ gtk_gizmo_grab_focus (GtkWidget *widget)
   return FALSE;
 }
 
+static void
+gtk_gizmo_css_changed (GtkWidget         *widget,
+                       GtkCssStyleChange *change)
+{
+  GtkGizmo *self = GTK_GIZMO (widget);
+
+  if (self->css_changed_func)
+    self->css_changed_func (self, change);
+}
+
 static void
 gtk_gizmo_finalize (GObject *object)
 {
@@ -115,6 +125,7 @@ gtk_gizmo_class_init (GtkGizmoClass *klass)
   widget_class->contains = gtk_gizmo_contains;
   widget_class->grab_focus = gtk_gizmo_grab_focus;
   widget_class->focus = gtk_gizmo_focus;
+  widget_class->css_changed = gtk_gizmo_css_changed;
 }
 
 static void
@@ -165,3 +176,12 @@ gtk_gizmo_new_with_role (const char            *css_name,
 
   return GTK_WIDGET (gizmo);
 }
+
+void
+gtk_gizmo_set_css_changed_func (GtkGizmo               *gizmo,
+                                GtkGizmoCssChangedFunc  css_changed_func)
+{
+  g_return_if_fail (!gtk_widget_get_realized (GTK_WIDGET (gizmo)));
+
+  gizmo->css_changed_func = css_changed_func;
+}
diff --git a/gtk/gtkgizmoprivate.h b/gtk/gtkgizmoprivate.h
index 9257201a59..a830e3550d 100644
--- a/gtk/gtkgizmoprivate.h
+++ b/gtk/gtkgizmoprivate.h
@@ -33,7 +33,9 @@ typedef gboolean (* GtkGizmoContainsFunc) (GtkGizmo  *gizmo,
                                            double     y);
 typedef gboolean (* GtkGizmoFocusFunc)    (GtkGizmo         *gizmo,
                                            GtkDirectionType  direction);
-typedef gboolean (* GtkGizmoGrabFocusFunc)(GtkGizmo         *gizmo);
+typedef gboolean (* GtkGizmoGrabFocusFunc) (GtkGizmo         *gizmo);
+typedef void     (* GtkGizmoCssChangedFunc) (GtkGizmo          *gizmo,
+                                             GtkCssStyleChange *change);
 
 struct _GtkGizmo
 {
@@ -45,6 +47,7 @@ struct _GtkGizmo
   GtkGizmoContainsFunc  contains_func;
   GtkGizmoFocusFunc     focus_func;
   GtkGizmoGrabFocusFunc grab_focus_func;
+  GtkGizmoCssChangedFunc css_changed_func;
 };
 
 struct _GtkGizmoClass
@@ -71,5 +74,7 @@ GtkWidget *gtk_gizmo_new_with_role (const char            *css_name,
                                     GtkGizmoFocusFunc      focus_func,
                                     GtkGizmoGrabFocusFunc  grab_focus_func);
 
+void gtk_gizmo_set_css_changed_func (GtkGizmo               *gizmo,
+                                     GtkGizmoCssChangedFunc  css_changed_func);
 
 #endif