diff --git a/z.sh b/z.sh
index c78f3cb..55fa3ec 100644
--- a/z.sh
+++ b/z.sh
@@ -247,7 +247,7 @@ elif type complete >/dev/null 2>&1; then
     [ "$_Z_NO_PROMPT_COMMAND" ] || {
         # populate directory list. avoid clobbering other PROMPT_COMMANDs.
         grep "_z --add" <<< "$PROMPT_COMMAND" >/dev/null || {
-            PROMPT_COMMAND="$PROMPT_COMMAND"$'\n''(_z --add "$(command pwd '$_Z_RESOLVE_SYMLINKS' 2>/dev/null)" 2>/dev/null &);'
+            PROMPT_COMMAND=$'\n''(_z --add "$(command pwd '$_Z_RESOLVE_SYMLINKS' 2>/dev/null)" 2>/dev/null &);'"$PROMPT_COMMAND"
         }
     }
 fi