diff --git a/testing/ostest/cancel.c b/testing/ostest/cancel.c
index f9751ee05..c5b212c3f 100644
--- a/testing/ostest/cancel.c
+++ b/testing/ostest/cancel.c
@@ -236,6 +236,7 @@ static FAR void *sig_waiter(FAR void *parameter)
 
   printf("sig_waiter: Waiting to receive signal %d ...\n", SIG_WAITCANCEL);
 
+  sigemptyset(&set);
   ret = sigwaitinfo(&set, &info);
 
   pthread_testcancel();