diff --git a/ethereum/contracts/mock/MockRelayerIntegration.sol b/ethereum/contracts/mock/MockRelayerIntegration.sol
index 435df32..9de6b1b 100644
--- a/ethereum/contracts/mock/MockRelayerIntegration.sol
+++ b/ethereum/contracts/mock/MockRelayerIntegration.sol
@@ -271,4 +271,6 @@ contract MockRelayerIntegration is IWormholeReceiver {
         furtherInstructions.chains = chains;
         furtherInstructions.gasLimits = gasLimits;
     }
+
+    receive() external payable {}
 }