diff --git a/lib_standalone/Arduino.cpp b/lib_standalone/Arduino.cpp
index cf7651354..3932cce76 100644
--- a/lib_standalone/Arduino.cpp
+++ b/lib_standalone/Arduino.cpp
@@ -29,6 +29,7 @@
 
 NativeConsole Serial;
 
+EspClass  ESP;
 ETHClass  ETH;
 WiFiClass WiFi;
 
diff --git a/lib_standalone/Arduino.h b/lib_standalone/Arduino.h
index e521fa40b..e1f19c0fe 100644
--- a/lib_standalone/Arduino.h
+++ b/lib_standalone/Arduino.h
@@ -34,6 +34,15 @@
 #include "WString.h"
 #include "Network.h"
 
+// stub of Arduino-ESP32's EspClass, holding only what is called outside of #ifndef EMSESP_STANDALONE
+class EspClass {
+  public:
+    size_t getPsramSize() {
+        return 0; // standalone has no PSRAM
+    }
+};
+
+extern EspClass  ESP;
 extern ETHClass  ETH;
 extern WiFiClass WiFi;