diff --git a/cores/esp32/WString.h b/cores/esp32/WString.h index 11b12aa08a5..98055c6e7a4 100644 --- a/cores/esp32/WString.h +++ b/cores/esp32/WString.h @@ -27,6 +27,7 @@ #include <string.h> #include <ctype.h> #include <pgmspace.h> +#include <stdint.h> // An inherited class for holding the result of a concatenation. These // result objects are assumed to be writable by subsequent concatenations.