diff --git a/autoload/lightline.vim b/autoload/lightline.vim
index b6bcebb..e85e589 100644
--- a/autoload/lightline.vim
+++ b/autoload/lightline.vim
@@ -2,7 +2,7 @@
 " Filename: autoload/lightline.vim
 " Author: itchyny
 " License: MIT License
-" Last Change: 2020/06/19 07:27:34.
+" Last Change: 2020/06/19 11:08:46.
 " =============================================================================
 
 let s:save_cpo = &cpo
@@ -198,13 +198,7 @@ function! lightline#colorscheme() abort
     let s:lightline.palette = g:lightline#colorscheme#{s:lightline.colorscheme}#palette
   finally
     if has('win32') && !has('gui_running') && &t_Co < 256
-      for u in values(s:lightline.palette)
-        for v in values(u)
-          for _  in v
-            let [_[2], _[3]] = [lightline#colortable#gui2cui(_[0], _[2]), lightline#colortable#gui2cui(_[1], _[3])]
-          endfor
-        endfor
-      endfor
+      call lightline#colortable#gui2cui_palette(s:lightline.palette)
     endif
     let s:highlight = {}
     call lightline#highlight('normal')
diff --git a/autoload/lightline/colortable.vim b/autoload/lightline/colortable.vim
index 82617b2..6cdddd8 100644
--- a/autoload/lightline/colortable.vim
+++ b/autoload/lightline/colortable.vim
@@ -2,7 +2,7 @@
 " Filename: autoload/lightline/colortable.vim
 " Author: itchyny
 " License: MIT License
-" Last Change: 2015/03/29 06:21:39.
+" Last Change: 2020/06/19 11:07:13.
 " =============================================================================
 
 let s:save_cpo = &cpo
@@ -38,5 +38,15 @@ function! lightline#colortable#gui2cui(rgb, fallback) abort
   return rgb[0] + rgb[1] + rgb[2]
 endfunction
 
+function! lightline#colortable#gui2cui_palette(palette) abort
+  for u in values(a:palette)
+    for v in values(u)
+      for w in v
+        let [w[2], w[3]] = [lightline#colortable#gui2cui(w[0], w[2]), lightline#colortable#gui2cui(w[1], w[3])]
+      endfor
+    endfor
+  endfor
+endfunction
+
 let &cpo = s:save_cpo
 unlet s:save_cpo