diff --git a/tests/test_sandbox.c b/tests/test_sandbox.c
index b91b2b16..ebf436f0 100644
--- a/tests/test_sandbox.c
+++ b/tests/test_sandbox.c
@@ -18,6 +18,7 @@ static void test_create(void) {
 
   if (GDK_IS_X11_DISPLAY(display)) {
     g_test_skip("not running under X11");
+    return;
   }
 #endif