diff --git a/zshrc b/zshrc
index 4561b25..d53aa02 100644
--- a/zshrc
+++ b/zshrc
@@ -9,7 +9,7 @@ SAVEHIST=2000
 setopt appendhistory autocd extendedglob
 
 if [ -x /usr/bin/xset ]; then
-	if [ -v DISPLAY ]; then
+	if [ ${DISPLAY} ]; then
 		xset -b
 	fi
 fi