diff --git a/include/rtti/typeinfo.h b/include/rtti/typeinfo.h
index cb90a16..d9711f4 100644
--- a/include/rtti/typeinfo.h
+++ b/include/rtti/typeinfo.h
@@ -188,4 +188,9 @@ extern int64_t length(var);
 extern int32_t reference(var);
 extern void    dereference(var);
 
+extern int bit_test(var, unsigned long);
+extern int bit_set(var, unsigned long);
+extern int bit_clr(var, unsigned long);
+extern int bit_clrall(var);
+
 #endif