diff --git a/src/net/lookup_test.go b/src/net/lookup_test.go
index 1663b78ef00..2bc5592d5ad 100644
--- a/src/net/lookup_test.go
+++ b/src/net/lookup_test.go
@@ -1179,12 +1179,9 @@ func TestWithUnexpiredValuesPreserved(t *testing.T) {
 	}
 }
 
-// Issue 31586: don't crash on null byte in name
+// Issue 31597: don't panic on null byte in name
 func TestLookupNullByte(t *testing.T) {
 	testenv.MustHaveExternalNetwork(t)
 	testenv.SkipFlakyNet(t)
-	_, err := LookupHost("foo\x00bar") // used to crash on Windows
-	if err == nil {
-		t.Errorf("unexpected success")
-	}
+	LookupHost("foo\x00bar") // check that it doesn't panic; it used to on Windows
 }