diff --git a/platformio.ini b/platformio.ini
index 773eb4401..57b6c9404 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -85,6 +85,7 @@ build_flags                 = -DCORE_DEBUG_LEVEL=0
                               -free
                               -fipa-pta
                               -Wreturn-type
+                              -DTASMOTA  ; flag indicating that we are compiling Tasmota
 ; *********************************************************************
 ; *** Use custom settings from file user_config_override.h
                               -DUSE_CONFIG_OVERRIDE