diff --git a/libraries/pico_explorer/pico_explorer.cpp b/libraries/pico_explorer/pico_explorer.cpp
index 6195c07f..ee392be2 100644
--- a/libraries/pico_explorer/pico_explorer.cpp
+++ b/libraries/pico_explorer/pico_explorer.cpp
@@ -1,6 +1,7 @@
 #include <math.h>
 #include <string.h>
 
+#include "hardware/gpio.h"
 #include "hardware/pwm.h"
 #include "hardware/adc.h"