diff --git a/zbootstrap.zsh b/zbootstrap.zsh
index af91820..6c596d3 100644
--- a/zbootstrap.zsh
+++ b/zbootstrap.zsh
@@ -12,7 +12,12 @@ if ! [[ -d ${zshlibs_install} ]]
 then
   zlibs_install
 else
-  zshlibs_update
+  if zmodload -s zsh/sched
+  then
+    sched +0 zshlibs_update
+  else
+    zshlibs_update
+  fi
 fi
 
 source ${zshlibs_install}/tools.zsh