diff --git a/ui/gtk.c b/ui/gtk.c
index dcce36d243..dfffbb86f2 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -74,6 +74,16 @@
 
 #define MAX_VCS 10
 
+
+/* Compatibility define to let us build on both Gtk2 and Gtk3 */
+#if GTK_CHECK_VERSION(3, 0, 0)
+static inline void gdk_drawable_get_size(GdkWindow *w, gint *ww, gint *wh)
+{
+    *ww = gdk_window_get_width(w);
+    *wh = gdk_window_get_height(w);
+}
+#endif
+
 typedef struct VirtualConsole
 {
     GtkWidget *menu_item;