diff --git a/sketches/doorbell-touch-esp32-32e/DisplayDriverGFX.cpp b/sketches/doorbell-touch-esp32-32e/DisplayDriverGFX.cpp
index 95aa1f2..033931d 100644
--- a/sketches/doorbell-touch-esp32-32e/DisplayDriverGFX.cpp
+++ b/sketches/doorbell-touch-esp32-32e/DisplayDriverGFX.cpp
@@ -4,6 +4,7 @@
 // For the TFT_eSPI path this file compiles to nothing.
 // ═══════════════════════════════════════════════════════════════════
 #include "BoardConfig.h"
+#include <Arduino.h>
 
 #if USE_ARDUINO_GFX
 
diff --git a/sketches/doorbell-touch-esp32-32e/TouchDriverGT911.cpp b/sketches/doorbell-touch-esp32-32e/TouchDriverGT911.cpp
index 0b6db1b..fe4630a 100644
--- a/sketches/doorbell-touch-esp32-32e/TouchDriverGT911.cpp
+++ b/sketches/doorbell-touch-esp32-32e/TouchDriverGT911.cpp
@@ -1,4 +1,5 @@
 #include "BoardConfig.h"
+#include <Arduino.h>
 
 #if USE_TOUCH_GT911