diff --git a/TFT_eSPI.cpp b/TFT_eSPI.cpp
index b4921c6..9530227 100644
--- a/TFT_eSPI.cpp
+++ b/TFT_eSPI.cpp
@@ -831,6 +831,7 @@ void busDir(uint32_t mask, uint8_t mode)
   return; //*/
 }
 
+#include "driver/rtc_io.h"
 // Set ESP32 GPIO pin to input or output
 void gpioMode(uint8_t gpio, uint8_t mode)
 {