diff --git a/lib/child-writer/constants.js b/lib/child-writer/constants.js
index 86aca7bf..9301d7c0 100644
--- a/lib/child-writer/constants.js
+++ b/lib/child-writer/constants.js
@@ -31,7 +31,7 @@ module.exports = {
    * @memberof CONSTANTS
    * @constant
    */
-  TMP_DIRECTORY: process.env.XDG_RUNTIME_DIR || os.tmpdir(),
+  TMP_DIRECTORY: path.join(process.env.XDG_RUNTIME_DIR || os.tmpdir(), path.sep),
 
   /**
    * @property {String} PROJECT_ROOT