diff --git a/hardware/tools/esp8266/sdk/include/c_types.h b/hardware/tools/esp8266/sdk/include/c_types.h
index df3739e4b..d9f00fbbb 100644
--- a/hardware/tools/esp8266/sdk/include/c_types.h
+++ b/hardware/tools/esp8266/sdk/include/c_types.h
@@ -74,10 +74,7 @@ typedef enum {
 #endif /* ICACHE_FLASH */
 
 #ifndef __cplusplus
-//typedef unsigned char   bool;
 #define BOOL            bool
-//#define true            (1)
-//#define false           (0)
 #define TRUE            true
 #define FALSE           false