diff --git a/Jakefile.js b/Jakefile.js
index 7f0915ad7e9..40520e79a4a 100644
--- a/Jakefile.js
+++ b/Jakefile.js
@@ -106,6 +106,7 @@ var harnessCoreSources = [
     "loggedIO.ts",
     "rwcRunner.ts",
     "userRunner.ts",
+    "definitelyRunner.ts",
     "test262Runner.ts",
     "./parallel/shared.ts",
     "./parallel/host.ts",