diff --git a/api/Common.h b/api/Common.h
index 9b28f40a..dab617c2 100644
--- a/api/Common.h
+++ b/api/Common.h
@@ -93,7 +93,7 @@ typedef void (*voidFuncPtrParam)(void*);
 #endif
 
 /* TODO: request for removal */
-typedef bool      boolean;
+typedef bool      boolean __attribute__((deprecated));
 typedef uint8_t   byte;
 typedef uint16_t  word;