diff --git a/esphome/components/esp8266/core.h b/esphome/components/esp8266/core.h
index 8c9ffd40a4..8df9e26d55 100644
--- a/esphome/components/esp8266/core.h
+++ b/esphome/components/esp8266/core.h
@@ -3,6 +3,7 @@
 #ifdef USE_ESP8266
 
 #include <cstdint>
+#include "esphome/core/hal.h"
 
 extern const uint8_t ESPHOME_ESP8266_GPIO_INITIAL_MODE[16] PROGMEM;
 extern const uint8_t ESPHOME_ESP8266_GPIO_INITIAL_LEVEL[16] PROGMEM;