diff --git a/middleware/include/timer.h b/middleware/include/timer.h
index 76a7c317..5afd5aa5 100644
--- a/middleware/include/timer.h
+++ b/middleware/include/timer.h
@@ -2,6 +2,7 @@
 #define TIMER_H
 
 #include "stm32xx_hal.h"
+#include <stdint.h>
 #include <stdbool.h>
 
 typedef struct {