diff --git a/src/gui_gtk_x11.c b/src/gui_gtk_x11.c
index 2a11c4a..762bdc1 100644
--- a/src/gui_gtk_x11.c
+++ b/src/gui_gtk_x11.c
@@ -4531,11 +4531,14 @@
 
     pixel_width = (guint)(gui_get_base_width() + Columns * gui.char_width);
     pixel_height = (guint)(gui_get_base_height() + Rows * gui.char_height);
+
+# if !GTK_CHECK_VERSION(3,0,0)
     // For GTK2 changing the size of the form widget doesn't cause window
     // resizing.
     if (gtk_socket_id == 0)
 	gtk_window_resize(GTK_WINDOW(gui.mainwin), pixel_width, pixel_height);
     update_window_manager_hints(0, 0);
+# endif
 
     if (foreground_argument != NULL)
 	fg_pixel = gui_get_color((char_u *)foreground_argument);