diff --git a/package.json b/package.json
index 25b9f95..74e44b4 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "A simple request url rewriter as a minimal wrapper around String.prototype.replace",
   "main": "lib/index.js",
   "scripts": {
-    "test": "./node_modules/.bin/istanbul test ./node_modules/.bin/_mocha -- -R spec spec",
+    "test": "./node_modules/.bin/istanbul test -x \"**/spec/**\" ./node_modules/.bin/_mocha -- -R spec spec",
     "report-cov": "cat ./coverage/lcov.info | ./node_modules/.bin/coveralls"
   },
   "repository": {