diff --git a/rc b/rc
index 857746d..e35d887 100644
--- a/rc
+++ b/rc
@@ -11,6 +11,9 @@ export PATH
 . "$TOOLSPATH"/qcd_function
 
 # Update self weekly
+[[ -t 0 ]] || return
+[[ -t 1 ]] || return
+[[ -t 2 ]] || return
 [[ -f "$TOOLSPATH"/.lastupdate ]] || touch -t 0101010101 "$TOOLSPATH"/.lastupdate 2> /dev/null
 [[ -f "$TOOLSPATH"/.lastupdate ]] || return