diff --git a/z.sh b/z.sh
index 9a6afde..a564cb5 100755
--- a/z.sh
+++ b/z.sh
@@ -166,6 +166,9 @@ z() {
 if complete &> /dev/null; then
   # bash tab completion
   complete -C 'z --complete "$COMP_LINE"' z
+  # populate directory list. avoid clobbering other PROMPT_COMMANDs.
+  echo $PROMPT_COMMAND | grep -q "z --add"
+  [ $? -gt 0 ] && PROMPT_COMMAND='z --add "$(pwd -P 2>/dev/null)";'"$PROMPT_COMMAND"
 elif compctl &> /dev/null; then
   # zsh tab completion
   _z_zsh_tab_completion() {
@@ -175,7 +178,3 @@ elif compctl &> /dev/null; then
   }
   compctl -U -K _z_zsh_tab_completion z
 fi
-
-# populate directory list. avoid clobbering other PROMPT_COMMANDs.
-echo $PROMPT_COMMAND | grep -q "z --add"
-[ $? -gt 0 ] && PROMPT_COMMAND='z --add "$(pwd -P 2>/dev/null)";'"$PROMPT_COMMAND"