diff --git a/wrapper/main.c b/wrapper/main.c
index cdf7d687..f54ed80b 100644
--- a/wrapper/main.c
+++ b/wrapper/main.c
@@ -110,10 +110,8 @@ wrapper_gproxy_set (DBusGProxy              *dbus_gproxy,
           break;
 
         case PROVIDER_PROP_TYPE_SET_OPACITY:
-#if GTK_CHECK_VERSION (3, 0, 0)
           plug = g_object_get_qdata (G_OBJECT (provider), plug_quark);
           wrapper_plug_set_opacity (plug, g_value_get_double (value));
-#endif
           break;
 
         case PROVIDER_PROP_TYPE_SET_BACKGROUND_COLOR:
diff --git a/wrapper/wrapper-plug.c b/wrapper/wrapper-plug.c
index 9bad4d25..b250fe15 100644
--- a/wrapper/wrapper-plug.c
+++ b/wrapper/wrapper-plug.c
@@ -371,7 +371,6 @@ wrapper_plug_new (GdkNativeWindow socket_id)
 
 
 
-#if GTK_CHECK_VERSION (3, 0, 0)
 void
 wrapper_plug_set_opacity (WrapperPlug *plug,
                           gdouble      opacity)
@@ -379,10 +378,14 @@ wrapper_plug_set_opacity (WrapperPlug *plug,
 
   panel_return_if_fail (WRAPPER_IS_PLUG (plug));
 
+#if GTK_CHECK_VERSION (3, 0, 0)
   if (gtk_widget_get_opacity (GTK_WIDGET (plug)) != opacity)
     gtk_widget_set_opacity (GTK_WIDGET (plug), opacity);
-}
+#else
+  if (gtk_window_get_opacity (GTK_WINDOW (plug)) != opacity)
+    gtk_window_set_opacity (GTK_WINDOW (plug), opacity);
 #endif
+}