diff --git a/main.cpp b/main.cpp
index 08c13b0..1f9a255 100644
--- a/main.cpp
+++ b/main.cpp
@@ -55,6 +55,7 @@
 #include <iostream>
 #include <typeinfo>
 #include <algorithm>
+#include <cmath> // std::pow
 
 /*********************
  *      DEFINES
diff --git a/sim/FreeRTOS.h b/sim/FreeRTOS.h
index 47d7db9..02b7f19 100644
--- a/sim/FreeRTOS.h
+++ b/sim/FreeRTOS.h
@@ -60,6 +60,7 @@
 #define NRF_ERROR_INVALID_ADDR                (NRF_ERROR_BASE_NUM + 16) ///< Bad Memory Address
 #define NRF_ERROR_BUSY                        (NRF_ERROR_BASE_NUM + 17) ///< Busy
 #include <stdexcept>
+#include <string> // std::to_string()
 template<typename T>
 void APP_ERROR_HANDLER(T err) {
   throw std::runtime_error("APP_ERROR_HANDLER: " + std::to_string(err));
diff --git a/sim/nrfx/hal/nrf_gpio.cpp b/sim/nrfx/hal/nrf_gpio.cpp
index d4f2737..6e5a35c 100644
--- a/sim/nrfx/hal/nrf_gpio.cpp
+++ b/sim/nrfx/hal/nrf_gpio.cpp
@@ -4,6 +4,7 @@
 
 #include <SDL2/SDL.h>
 #include <stdexcept>
+#include <string> // std::to_string
 
 void nrf_gpio_cfg_default(uint32_t pin_number) {}
 void nrf_gpio_pin_set(uint32_t pin_number) {}
diff --git a/sim/nrfx/hal/nrf_rtc.cpp b/sim/nrfx/hal/nrf_rtc.cpp
index 7b93c55..e199762 100644
--- a/sim/nrfx/hal/nrf_rtc.cpp
+++ b/sim/nrfx/hal/nrf_rtc.cpp
@@ -3,6 +3,7 @@
 #include "task.h"
 #include <chrono>
 #include <stdexcept>
+#include <string> // std::to_string
 
 uint32_t nrf_rtc_counter_get(NRF_RTC_Type p_reg)
 {