diff --git a/t/op/sub.t b/t/op/sub.t
index e703880ec8b6..b00876fb4a01 100644
--- a/t/op/sub.t
+++ b/t/op/sub.t
@@ -426,6 +426,7 @@ eval '
    CORE::state sub b; sub d { sub b {} sub d }
  ';
 eval '()=%e; sub e { sub e; eval q|$x| } e;';
+watchdog 0;
 
 fresh_perl_like(
     q#<s,,$0[sub{m]]]],}>0,shift#,