diff --git a/libozsh.zsh b/libozsh.zsh
index 8329078..5a6fec4 100644
--- a/libozsh.zsh
+++ b/libozsh.zsh
@@ -51,7 +51,7 @@ function ozsh_update {
 
 function ozsh_autoupdate {
 	local timediff=$(( ($(date --date="$(date)" +%s) - $(date --date="$(cat $OZSH_LASTUPDATE_FILE)" +%s) ) / (60*60*24) ))
-	if [ $timediff -ge 7 ]; then
+	if [ "$timediff" -ge "7" ]; then
 		vared -p 'Would you like to update ozsh? [y/N]: ' -c answer
 		if [ "$answer" == "y" || "$answer" == "Y" ]; then
 			ozsh_update