diff --git a/autoload/vimtex/compiler/latexmk.vim b/autoload/vimtex/compiler/latexmk.vim
index 52c2c9d16e..01deea5fde 100644
--- a/autoload/vimtex/compiler/latexmk.vim
+++ b/autoload/vimtex/compiler/latexmk.vim
@@ -628,9 +628,11 @@ endfunction
 function! s:wrap_option_appendcmd(name, value) abort " {{{1
   " Do not use with $ in value. On linux, we use double quoted perl strings
   " that interpolate.
+  let l:win_cmd_sep = has('nvim') ? '^&' : '&'
+  let l:common = a:name . ' = ($' . a:name . ' ? $' . a:name
   return has('win32')
-        \ ? vimtex#compiler#latexmk#wrap_option(a:name, a:value)
-        \ : ' -e ''$' . a:name . ' = ($' . a:name . ' ? $' . a:name . ' . " ; " : "") . "' . a:value . '"'''
+        \ ? ' -e "$' . l:common . ' . '' ' . l:win_cmd_sep . ' '' : '''') . ''' . a:value . '''"'
+        \ : ' -e ''$' . l:common . ' . " ; " : "") . "' . a:value . '"'''
 endfunction
 
 "}}}1