diff --git a/cores/esp8266/core_esp8266_features.h b/cores/esp8266/core_esp8266_features.h
index 0dc202383..aff8fa4de 100644
--- a/cores/esp8266/core_esp8266_features.h
+++ b/cores/esp8266/core_esp8266_features.h
@@ -27,9 +27,13 @@
 
 #define CORE_HAS_LIBB64
 #define CORE_HAS_BASE64_CLASS
+#define CORE_HAS_CXA_GUARD
+#define CORE_HAS_UMM
 
 #define WIFI_HAS_EVENT_CALLBACK
 
 
+
+
 #endif