autoload/lsp/lspserver.vim | 10 +---------

diff --git a/autoload/lsp/lspserver.vim b/autoload/lsp/lspserver.vim
index 86d94fe219e63b3f89abf5d3b555a7cff5c90195..ae7a4707088f9b6d809c9593644f67bd11a6f617 100644
--- a/autoload/lsp/lspserver.vim
+++ b/autoload/lsp/lspserver.vim
@@ -718,17 +718,9 @@   var req = lspserver.createRequest(cmd)
 
   # interface DocumentFormattingParams
   # interface TextDocumentIdentifier
-  var tabsz: number
-  if &sts > 0
-    tabsz = &sts
-  elseif &sts < 0
-    tabsz = &shiftwidth
-  else
-    tabsz = &tabstop
-  endif
   # interface FormattingOptions
   var fmtopts: dict<any> = {
-    tabSize: tabsz,
+    tabSize: shiftwidth(),
     insertSpaces: &expandtab ? true : false,
   }
   #req.params->extend({textDocument: {uri: util.LspFileToUri(fname)},