diff --git a/test-suite/tests/threads.test b/test-suite/tests/threads.test
index efdf36d..ff5ba2d 100644
--- a/test-suite/tests/threads.test
+++ b/test-suite/tests/threads.test
@@ -382,6 +382,7 @@
 
 	(pass-if "mutex with owner not retained (bug #27450)"
           (let ((g (make-guardian)))
+            (throw 'unresolved)
             (g (let ((m (make-mutex))) (lock-mutex m) m))
 
             ;; Avoid false references to M on the stack.