diff --git a/package.json b/package.json
index 11d08a2a..e76abfb6 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,8 @@
     },
     "devDependencies" : {
         "tap" : "~0.3.0",
-        "falafel" : "~0.1.4"
+        "falafel" : "~0.1.4",
+        "concat-stream": "~1.5.1"
     },
     "scripts" : {
         "test" : "tap test/*.js"