diff --git a/zsh/prompt.zsh b/zsh/prompt.zsh
index 3cad3ac..8f4d0c2 100644
--- a/zsh/prompt.zsh
+++ b/zsh/prompt.zsh
@@ -1,11 +1,15 @@
 # ===== use colorized output
 autoload -Uz colors; colors
 
-if [[ $IS_MAC -eq 1 ]]; then
-	export CLICOLOR=1
-	export LSCOLORS=gxfxcxdxbxegedabagacad
-fi
-export LS_COLORS=di='36;40:ln=35;40:so=32;40:pi=33;40:ex=31;40:bd=34;46:cd=34;43:su=0;41:sg=0;46:tw=0;42:ow=0;43:'
+case "$OSTYPE" in
+	darwin*|bsd*)
+		export CLICOLOR=1
+		export LSCOLORS=gxfxcxdxbxegedabagacad
+		;;
+	*)
+		export LS_COLORS=di='36;40:ln=35;40:so=32;40:pi=33;40:ex=31;40:bd=34;46:cd=34;43:su=0;41:sg=0;46:tw=0;42:ow=0;43:'
+		;;
+esac
 
 # ===== setopts and misc
 # only show RPROMPT on the current prompt