diff --git a/ui.vim b/ui.vim
index 2c8b808..acca9c4 100644
--- a/ui.vim
+++ b/ui.vim
@@ -3,7 +3,7 @@
 " Enable true colors support. Do not use this option if your terminal does not
 " support true colors! For a comprehensive list of terminals supporting true
 " colors, see https://github.com/termstandard/colors and https://bit.ly/2InF97t.
-if $TERM == "xterm-256color"
+if $TERM == "xterm-256color" || exists('g:started_by_firenvim')
     set termguicolors
 endif
 " Use dark background