diff --git a/shell/pinyin-comp.zsh b/shell/pinyin-comp.zsh
old mode 100644
new mode 100755
index 4f5b604..1c84a52
--- a/shell/pinyin-comp.zsh
+++ b/shell/pinyin-comp.zsh
@@ -1,5 +1,10 @@
 
 # use pinyin-comp to perform completion based upon pinyin acronym
+function _force_rehash() {
+  (( CURRENT == 1 )) && rehash
+  return 1
+}
+
 function _pinyin_comp()
 {
     # chsdir print one candidate per line