diff --git a/test/old/testdir/test_registers.vim b/test/old/testdir/test_registers.vim
index 720ce34ebc..6e6049fc6d 100644
--- a/test/old/testdir/test_registers.vim
+++ b/test/old/testdir/test_registers.vim
@@ -57,6 +57,9 @@ func Test_display_registers()
 
     " these commands work in the sandbox
     let a = execute('sandbox display')
+    " When X11 connection is not available, there is a warning W23
+    " filter this out (we could also run the :display comamand twice)
+    let a = substitute(a, 'W23.*0\n', '', '')
     let b = execute('sandbox registers')
 
     call assert_equal(a, b)