diff --git a/hw/xwayland/xwayland-screen.c b/hw/xwayland/xwayland-screen.c
index 37ee7da0f..6b57fbe9d 100644
--- a/hw/xwayland/xwayland-screen.c
+++ b/hw/xwayland/xwayland-screen.c
@@ -799,6 +799,7 @@ xwl_screen_init(ScreenPtr pScreen, int argc, char **argv)
             use_fixed_size = 1;
         }
         else if (strcmp(argv[i], "-fullscreen") == 0) {
+            use_fixed_size = 1;
             xwl_screen->fullscreen = 1;
         }
         else if (strcmp(argv[i], "-host-grab") == 0) {