diff --git a/variants/esp32/pins_arduino.h b/variants/esp32/pins_arduino.h
index 3663de76cd4..f9f1b95d010 100644
--- a/variants/esp32/pins_arduino.h
+++ b/variants/esp32/pins_arduino.h
@@ -2,6 +2,7 @@
 #define Pins_Arduino_h
 
 #include <stdint.h>
+#include <stdbool.h>
 
 static const uint8_t TX = 1;
 static const uint8_t RX = 3;