diff --git a/.zlogin b/.zlogin
index 856567c..c168e58 100644
--- a/.zlogin
+++ b/.zlogin
@@ -5,5 +5,10 @@ then
 fi
 date
 uptime
-[ -n "$SSH_AUTH_SOCK" ] && cd ~/zdot && cvs update -d -P && make install
+[ -n "$SSH_AUTH_SOCK" ] &&
+	cd ~/zdot &&
+	[ -z "`find .ts -mtime -1 2>/dev/null`" ] &&
+	cvs update -d -P &&
+	make install &&
+	touch .ts
 cd ~