diff --git a/packages/spawner/package.json b/packages/spawner/package.json
index bf9a19543fa8..ebbeed7f9eda 100644
--- a/packages/spawner/package.json
+++ b/packages/spawner/package.json
@@ -11,6 +11,7 @@
     "build": "yarn build-bundle-spawn",
     "build-bundle-spawn": "node scripts/build-bundle-spawn.js",
     "test": "ava",
+    "test:c8": "c8 $C8_OPTIONS ava --config=ava-nesm.config.js",
     "test:xs": "exit 0",
     "lint-check": "yarn lint",
     "lint-fix": "eslint --fix '**/*.js'",
@@ -40,7 +41,8 @@
     "@agoric/bundle-source": "^1.4.5",
     "@agoric/install-ses": "^0.5.21",
     "@agoric/swingset-vat": "^0.19.0",
-    "ava": "^3.12.1"
+    "ava": "^3.12.1",
+    "c8": "^7.7.2"
   },
   "files": [
     "src/",