diff -r 93f07ccfd997 -r 6f7600c2b9e1 ui/motif/window.c
--- a/ui/motif/window.c	Thu Dec 11 19:52:44 2025 +0100
+++ b/ui/motif/window.c	Thu Dec 11 20:07:16 2025 +0100
@@ -74,11 +74,10 @@
 }
 
 
-static UiObject* create_window(const char *title, void *window_data, Boolean simple) {
+static UiObject* create_window(const char *title, Boolean simple) {
     CxMempool *mp = cxMempoolCreateSimple(256);
     const CxAllocator *a = mp->allocator;
     UiObject *obj = uic_object_new_toplevel();
-    obj->window = window_data;
     obj->destroy = ui_window_widget_destroy;
     
     int window_width = window_default_width;
@@ -151,12 +150,12 @@
     return obj;
 } 
 
-UiObject* ui_window(const char *title, void *window_data) {
-    return create_window(title, window_data, FALSE);
+UiObject* ui_window(const char *title) {
+    return create_window(title, FALSE);
 }
 
-UiObject* ui_simple_window(const char *title, void *window_data) {
-    return create_window(title, window_data, TRUE);
+UiObject* ui_simple_window(const char *title) {
+    return create_window(title, TRUE);
 }
 
 void ui_window_size(UiObject *obj, int width, int height) {