diff --git a/rc b/rc
index dfd4b2e..797a4b2 100755
--- a/rc
+++ b/rc
@@ -24,7 +24,7 @@ function _self_update() {
 [[ -t 1 ]] || return
 [[ -t 2 ]] || return
 [[ -f "$TOOLSPATH"/.lastupdate ]] || touch -t 0101010101 "$TOOLSPATH"/.lastupdate 2> /dev/null
-[[ -f "$TOOLSPATH"/.lastupdate ]] || return
+[[ -w "$TOOLSPATH"/.lastupdate ]] || return
 
 TOOLS_LASTUPDATE=$(( $( date +%s ) - $( stat -c %Y "$TOOLSPATH"/.lastupdate ) ))
 [[ "$TOOLS_LASTUPDATE" -gt 604800 ]] && _self_update