diff --git a/autoload/limelight.vim b/autoload/limelight.vim
index 918a32d..cb62a14 100644
--- a/autoload/limelight.vim
+++ b/autoload/limelight.vim
@@ -139,7 +139,7 @@ function! s:dim(coeff)
   let fg = synIDattr(synid, 'fg#')
   let bg = synIDattr(synid, 'bg#')
 
-  if has('gui_running') || has('nvim') && $NVIM_TUI_ENABLE_TRUE_COLOR
+  if has('gui_running') || has('termguicolors') && &termguicolors
     if a:coeff < 0 && exists('g:limelight_conceal_guifg')
       let dim = g:limelight_conceal_guifg
     elseif empty(fg) || empty(bg)