diff -r 394f3b06dba1 -r 29b2821d1262 ui/gtk/button.c
--- a/ui/gtk/button.c	Thu May 15 22:13:25 2014 +0200
+++ b/ui/gtk/button.c	Fri May 16 16:19:46 2014 +0200
@@ -43,7 +43,7 @@
                 obj->ctx->mempool,
                 sizeof(UiEventData));
         event->obj = obj;
-        event->user_data = data;
+        event->userdata = data;
         event->callback = f;
         event->value = 0;
 
@@ -73,7 +73,7 @@
     e.document = event->obj->document;
     e.eventdata = NULL;
     e.intval = event->value;
-    event->callback(&e, event->user_data);
+    event->callback(&e, event->userdata);
 }
 
 void ui_button_toggled(GtkToggleToolButton *widget, UiEventData *event) {
@@ -83,5 +83,5 @@
     e.document = event->obj->document;
     e.eventdata = NULL;
     e.intval = gtk_toggle_tool_button_get_active(widget);
-    event->callback(&e, event->user_data);
+    event->callback(&e, event->userdata);
 }