diff --git a/STM32F1/cores/maple/wirish_types.h b/STM32F1/cores/maple/wirish_types.h
index 9a60fb3..f1ae4a0 100644
--- a/STM32F1/cores/maple/wirish_types.h
+++ b/STM32F1/cores/maple/wirish_types.h
@@ -63,7 +63,7 @@ typedef struct stm32_pin_info {
  * variable in Flash instead of RAM. */
 #define __FLASH__ __attr_flash
 
-typedef uint8 boolean;
+typedef bool boolean;
 typedef uint8 byte;
 
 #endif