diff --git a/z.sh b/z.sh
index eeaa2df..d0d0153 100644
--- a/z.sh
+++ b/z.sh
@@ -234,7 +234,7 @@ elif complete &> /dev/null; then
     [ "$_Z_NO_PROMPT_COMMAND" ] || {
         # populate directory list. avoid clobbering other PROMPT_COMMANDs.
         grep -q "_z --add" <<< "$PROMPT_COMMAND" || {
-            PROMPT_COMMAND="${PROMPT_COMMAND%;}${PROMPT_COMMAND:+;}"'_z --add "$(pwd '$_Z_RESOLVE_SYMLINKS' 2>/dev/null)" 2>/dev/null;'
+            PROMPT_COMMAND="$PROMPT_COMMAND"$'\n''_z --add "$(pwd '$_Z_RESOLVE_SYMLINKS' 2>/dev/null)" 2>/dev/null;'
         }
     }
 fi