diff --git a/packages/lodestar/test/e2e/network/peers/peerManager.test.ts b/packages/lodestar/test/e2e/network/peers/peerManager.test.ts
index da7ca8319bf3..fef6e5186cd1 100644
--- a/packages/lodestar/test/e2e/network/peers/peerManager.test.ts
+++ b/packages/lodestar/test/e2e/network/peers/peerManager.test.ts
@@ -107,6 +107,7 @@ describe("network / peers / PeerManager", function () {
     ping = sinon.stub();
     beaconBlocksByRange = sinon.stub();
     beaconBlocksByRoot = sinon.stub();
+    prune = sinon.stub();
   }
 
   it("Should request metadata on receivedPing of unknown peer", async () => {