diff --git a/include/etl/message_router.h b/include/etl/message_router.h
index a2fcf299..03b12b8f 100644
--- a/include/etl/message_router.h
+++ b/include/etl/message_router.h
@@ -295,7 +295,7 @@ namespace etl
     destination.receive(message);
   }
 
-#if ETL_CPP17_SUPPORTED
+#if ETL_CPP17_SUPPORTED && !defined(ETL_MESSAGE_ROUTER_FORCE_CPP03)
   //***************************************************************************
   // The definition for all message types.
   //***************************************************************************
diff --git a/test/etl_profile.h b/test/etl_profile.h
index 6ccf639b..469975bb 100644
--- a/test/etl_profile.h
+++ b/test/etl_profile.h
@@ -96,6 +96,7 @@ SOFTWARE.
   #define ETL_MEM_CAST_FORCE_CPP03
   #define ETL_MESSAGE_PACKET_FORCE_CPP03
   #define ETL_OBSERVER_FORCE_CPP03
+  #define ETL_MESSAGE_ROUTER_FORCE_CPP03
 #endif
 
 #if defined(ETL_FORCE_TEST_CPP11)