diff --git a/test/etl_profile.h b/test/etl_profile.h
index 2ef4c5f1..8cac498b 100644
--- a/test/etl_profile.h
+++ b/test/etl_profile.h
@@ -73,6 +73,8 @@ SOFTWARE.
 #define ETL_POLYMORPHIC_VECTOR
 #define ETL_POLYMORPHIC_INDIRECT_VECTOR
 
+#define ETL_CPP20_SUPPORTED 0
+
 //#define ETL_POLYMORPHIC_CONTAINERS
 
 //#define ETL_MESSAGES_ARE_VIRTUAL