diff --git a/libc/thread/pthread_setcanceltype.c b/libc/thread/pthread_setcanceltype.c
index f65187104..6aad36c6e 100644
--- a/libc/thread/pthread_setcanceltype.c
+++ b/libc/thread/pthread_setcanceltype.c
@@ -76,8 +76,10 @@ errno_t pthread_setcanceltype(int type, int *oldtype) {
       err = EINVAL;
       break;
   }
+#ifdef MODE_DBG
   STRACE("pthread_setcanceltype(%s, [%s]) → %s",
          DescribeCancelType(alloca(12), 0, &type),
          DescribeCancelType(alloca(12), err, oldtype), DescribeErrno(err));
+#endif
   return err;
 }