diff --git a/src/nvim/testdir/test_diffmode.vim b/src/nvim/testdir/test_diffmode.vim
index 00f4563f3d..1ba36ca8e9 100644
--- a/src/nvim/testdir/test_diffmode.vim
+++ b/src/nvim/testdir/test_diffmode.vim
@@ -752,6 +752,9 @@ func Test_diff_of_diff()
   if !CanRunVimInTerminal()
     return
   endif
+  if !has("rightleft")
+    throw 'Skipped: rightleft not supported'
+  endif
 
   call writefile([
 	\ 'call setline(1, ["aa","bb","cc","@@ -3,2 +5,7 @@","dd","ee","ff"])',