diff --git a/package.json b/package.json
index 4455bda..731c138 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
     },
     "scripts": {
         "test": "mocha -R spec test/**/*Test*.js",
-        "coverage": "istanbul cover -x *.test.js _mocha -- -R spec test/**/*Test*.js",
+        "coverage": "istanbul cover -x test/**/*Test*.js _mocha -- -R spec test/**/*Test*.js",
         "check-coverage": "istanbul check-coverage --statements 100 --branches 100 --functions 100 --lines 100"
     }
 }