diff --git a/autoload/SpaceVim/layers/ui.vim b/autoload/SpaceVim/layers/ui.vim
index 95014c686..a4b6f5505 100644
--- a/autoload/SpaceVim/layers/ui.vim
+++ b/autoload/SpaceVim/layers/ui.vim
@@ -53,8 +53,9 @@ function! SpaceVim#layers#ui#config() abort
   call SpaceVim#mapping#space#def('nnoremap', ['t', '8'], 'call call('
         \ . string(s:_function('s:toggle_fill_column')) . ', [])',
         \ 'highlight-long-lines', 1)
-  call SpaceVim#mapping#space#def('nnoremap', ['t', 'b'], 'call ToggleBG()',
-        \ 'toggle background', 1)
+  call SpaceVim#mapping#space#def('nnoremap', ['t', 'b'], 'call call('
+        \ . string(s:_function('s:toggle_background')) . ', [])',
+        \ 'toggle conceal', 1)
   call SpaceVim#mapping#space#def('nnoremap', ['t', 'c'], 'call call('
         \ . string(s:_function('s:toggle_conceal')) . ', [])',
         \ 'toggle conceal', 1)
@@ -281,3 +282,13 @@ func! s:toggle_conceal()
         setlocal conceallevel=0
     endif
 endf
+
+function! s:toggle_background()
+    let s:tbg = &background
+    " Inversion
+    if s:tbg ==# 'dark'
+        set background=light
+    else
+        set background=dark
+    endif
+endfunction
diff --git a/config/functions.vim b/config/functions.vim
index 10529e07d..e7b40f1ad 100644
--- a/config/functions.vim
+++ b/config/functions.vim
@@ -11,15 +11,6 @@ function! OnmiConfigForJsp()
         return "\<esc>a."
     endif
 endf
-function! ToggleBG()
-    let s:tbg = &background
-    " Inversion
-    if s:tbg ==# 'dark'
-        set background=light
-    else
-        set background=dark
-    endif
-endfunction
 function! BracketsFunc()
     let line = getline('.')
     let col = col('.')