diff --git a/yarn-project/p2p/src/client/test/p2p_client.integration_message_propagation.test.ts b/yarn-project/p2p/src/client/test/p2p_client.integration_message_propagation.test.ts
index d1a46b5dc807..6e8a9c402d61 100644
--- a/yarn-project/p2p/src/client/test/p2p_client.integration_message_propagation.test.ts
+++ b/yarn-project/p2p/src/client/test/p2p_client.integration_message_propagation.test.ts
@@ -71,6 +71,7 @@ describe('p2p client integration message propagation', () => {
     });
 
     attestationPool.isEmpty.mockResolvedValue(true);
+    attestationPool.tryAddBlockProposal.mockResolvedValue({ added: true, alreadyExists: false, totalForPosition: 1 });
 
     worldState.status.mockResolvedValue({
       state: mock(),