diff --git a/functions-common b/functions-common
index e8f8b10f79..4a9db34119 100644
--- a/functions-common
+++ b/functions-common
@@ -1202,7 +1202,7 @@ function get_plugin_packages {
     local package_dir=""
     for plugin in ${DEVSTACK_PLUGINS//,/ }; do
         local package_dir="$(_get_package_dir ${GITDIR[$plugin]}/devstack/files)"
-        files_to_parse+="$package_dir/$plugin"
+        files_to_parse+=" $package_dir/$plugin"
     done
     echo "$(_parse_package_files $files_to_parse)"
     $xtrace