diff --git a/BaS_gcc/include/bas_types.h b/BaS_gcc/include/bas_types.h
index 0c47b01..ee23d77 100644
--- a/BaS_gcc/include/bas_types.h
+++ b/BaS_gcc/include/bas_types.h
@@ -8,11 +8,11 @@
 #ifndef BAS_TYPES_H_
 #define BAS_TYPES_H_
 
-#ifndef _CPLUSPLUS_
+#ifndef __cplusplus
 typedef int bool;
 #define TRUE	1
 #define FALSE	0
-#endif /* _CPLUSPLUS_ */
+#endif /* __cplusplus */