diff --git a/pkgs/racket-test-core/tests/racket/udp.rktl b/pkgs/racket-test-core/tests/racket/udp.rktl
index 85f6dac37c..d902e7cd08 100644
--- a/pkgs/racket-test-core/tests/racket/udp.rktl
+++ b/pkgs/racket-test-core/tests/racket/udp.rktl
@@ -59,10 +59,10 @@
 (test #t byte? original-ttl)
 (test (void) udp-set-ttl! udp1 255)
 (test 255 udp-ttl udp1)
-(test (void) udp-set-ttl! udp1 0)
-(test 0 udp-ttl udp1)
+(test (void) udp-set-ttl! udp1 1)
+(test 1 udp-ttl udp1)
 (test (void) udp-set-ttl! udp1 original-ttl)
-(err/rt-test (udp-ttl 0))
+(err/rt-test (udp-ttl 1))
 (err/rt-test (udp-ttl 'no))
 (err/rt-test (udp-set-ttl! 0 64))
 (err/rt-test (udp-set-ttl! udp1 -1))