diff --git a/src/crypto/rand/rand_test.go b/src/crypto/rand/rand_test.go
index 2d84fdc900..5cf0ad8ec1 100644
--- a/src/crypto/rand/rand_test.go
+++ b/src/crypto/rand/rand_test.go
@@ -160,6 +160,9 @@ func TestAllocations(t *testing.T) {
 	if race.Enabled || msan.Enabled || asan.Enabled {
 		t.Skip("urandomRead allocates under -race, -asan, and -msan")
 	}
+	if runtime.GOOS == "plan9" {
+		t.Skip("plan9 allocates")
+	}
 	testenv.SkipIfOptimizationOff(t)
 
 	n := int(testing.AllocsPerRun(10, func() {