diff --git a/gtk/gtkdialog.c b/gtk/gtkdialog.c
index 11c1be5bc4..800119cf94 100644
--- a/gtk/gtkdialog.c
+++ b/gtk/gtkdialog.c
@@ -324,7 +324,7 @@ add_response_data (GtkDialog *dialog,
   if (GTK_IS_BUTTON (child))
     signal_id = g_signal_lookup ("clicked", GTK_TYPE_BUTTON);
   else
-    signal_id = GTK_WIDGET_GET_CLASS (child)->activate_signal;
+    signal_id = gtk_widget_class_get_activate_signal (GTK_WIDGET_GET_CLASS (child));
 
   if (signal_id)
     {
@@ -1287,7 +1287,7 @@ gtk_dialog_buildable_custom_finished (GtkBuildable *buildable,
       if (GTK_IS_BUTTON (object))
 	signal_id = g_signal_lookup ("clicked", GTK_TYPE_BUTTON);
       else
-	signal_id = GTK_WIDGET_GET_CLASS (object)->activate_signal;
+	signal_id = gtk_widget_class_get_activate_signal (GTK_WIDGET_GET_CLASS (object));
 
       if (signal_id && !is_action)
 	{
diff --git a/gtk/gtkinfobar.c b/gtk/gtkinfobar.c
index 6cfd14aaa7..608c6b77ff 100644
--- a/gtk/gtkinfobar.c
+++ b/gtk/gtkinfobar.c
@@ -551,7 +551,7 @@ gtk_info_bar_add_action_widget (GtkInfoBar *info_bar,
   if (GTK_IS_BUTTON (child))
     signal_id = g_signal_lookup ("clicked", GTK_TYPE_BUTTON);
   else
-    signal_id = GTK_WIDGET_GET_CLASS (child)->activate_signal;
+    signal_id = gtk_widget_class_get_activate_signal (GTK_WIDGET_GET_CLASS (child));
 
   if (signal_id)
     {
@@ -1019,7 +1019,7 @@ gtk_info_bar_buildable_custom_finished (GtkBuildable *buildable,
       if (GTK_IS_BUTTON (object))
         signal_id = g_signal_lookup ("clicked", GTK_TYPE_BUTTON);
       else
-        signal_id = GTK_WIDGET_GET_CLASS (object)->activate_signal;
+        signal_id = gtk_widget_class_get_activate_signal (GTK_WIDGET_GET_CLASS (object));
 
       if (signal_id)
         {