diff --git a/src/testdir/test_clientserver.vim b/src/testdir/test_clientserver.vim
index eb9fcb8..dbd832e 100644
--- a/src/testdir/test_clientserver.vim
+++ b/src/testdir/test_clientserver.vim
@@ -166,8 +166,10 @@
 
   call assert_fails('call remote_startserver([])', 'E730:')
   call assert_fails("let x = remote_peek([])", 'E730:')
-  call assert_fails("let x = remote_read('vim10')", ['E573:.*vim10'])
-  call assert_fails("call server2client('abc', 'xyz')", ['E573:.*abc'])
+  call assert_fails("let x = remote_read('vim10')",
+        \ [has('unix') ? 'E573:.*vim10' : 'E277:.*vim10'])
+  call assert_fails("call server2client('abc', 'xyz')",
+        \ [has('unix') ? 'E573:.*abc' : 'E258:.*abc'])
 endfunc
 
 " Uncomment this line to get a debugging log