diff --git a/unix/creds_test.go b/unix/creds_test.go
index a192845..483bfb1 100644
--- a/unix/creds_test.go
+++ b/unix/creds_test.go
@@ -89,8 +89,8 @@
 		if err != nil {
 			t.Fatalf("ReadMsgUnix: %v", err)
 		}
-		if flags != 0 {
-			t.Fatalf("ReadMsgUnix flags = 0x%x, want 0", flags)
+		if flags != 0 && flags != unix.MSG_CMSG_CLOEXEC {
+			t.Fatalf("ReadMsgUnix flags = %#x, want 0 or %#x (MSG_CMSG_CLOEXEC)", flags, unix.MSG_CMSG_CLOEXEC)
 		}
 		if n != tt.dataLen {
 			t.Fatalf("ReadMsgUnix n = %d, want %d", n, tt.dataLen)