diff --git a/package.json b/package.json
index 9b4c495..dba6ca7 100644
--- a/package.json
+++ b/package.json
@@ -47,5 +47,9 @@
       "pre-commit": "npm test",
       "pre-push": "npm test"
     }
+  },
+  "nyc": {
+    "include": "src",
+    "exclude": "src/typechain"
   }
 }