diff --git a/include/tlibc/std.h b/include/tlibc/std.h
index 6d04233..6b930b6 100755
--- a/include/tlibc/std.h
+++ b/include/tlibc/std.h
@@ -23,7 +23,7 @@ typedef float f32;
 typedef double f64;
 typedef void* ptr;
 
-#if !__cplusplus
+#if !__cplusplus && !defined(bool)
 typedef u8 bool;
 #define true  1
 #define false 0