diff --git a/src/messaging/tests/TestReliableMessageProtocol.cpp b/src/messaging/tests/TestReliableMessageProtocol.cpp
index 4eaa0f6f5c9d77..234d32056ee928 100644
--- a/src/messaging/tests/TestReliableMessageProtocol.cpp
+++ b/src/messaging/tests/TestReliableMessageProtocol.cpp
@@ -128,14 +128,10 @@ class MockAppDelegate : public ExchangeDelegate
 class MockSessionEstablishmentExchangeDispatch : public Messaging::ApplicationExchangeDispatch
 {
 public:
-    bool IsReliableTransmissionAllowed() const override { return mRetainMessageOnSend; }
-
     bool MessagePermitted(uint16_t protocol, uint8_t type) override { return true; }
 
     bool IsEncryptionRequired() const override { return mRequireEncryption; }
 
-    bool mRetainMessageOnSend = true;
-
     bool mRequireEncryption = false;
 };
 
@@ -329,8 +325,6 @@ void CheckFailedMessageRetainOnSend(nlTestSuite * inSuite, void * inContext)
         64_ms32, // CHIP_CONFIG_MRP_DEFAULT_ACTIVE_RETRY_INTERVAL
     });
 
-    mockSender.mMessageDispatch.mRetainMessageOnSend = false;
-
     // Let's drop the initial message
     gLoopback.mSentMessageCount    = 0;
     gLoopback.mNumMessagesToDrop   = 1;