diff --git a/src/MQTTAsyncUtils.c b/src/MQTTAsyncUtils.c
index 85158b62..c084a11e 100644
--- a/src/MQTTAsyncUtils.c
+++ b/src/MQTTAsyncUtils.c
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2009, 2024 IBM Corp., Ian Craggs and others
+ * Copyright (c) 2009, 2025 IBM Corp., Ian Craggs and others
  *
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v2.0
@@ -2378,6 +2378,10 @@ thread_return_type WINAPI MQTTAsync_receiveThread(void* n)
 					m->c->connected = 0; /* don't send disconnect packet back */
 					nextOrClose(m, discrc, "Received disconnect");
 				}
+				else
+				{
+					Log(LOG_ERROR, -1, "An unexpected packet type %u has been received", pack->header.bits.type);
+				}
 			}
 		}
 	}