diff --git a/inc/Maat_rule.h b/inc/Maat_rule.h
index 0f595fc..a6e7be4 100644
--- a/inc/Maat_rule.h
+++ b/inc/Maat_rule.h
@@ -13,6 +13,9 @@
 */
 #ifndef H_MAAT_RULE_H_INCLUDE
 #define H_MAAT_RULE_H_INCLUDE
+#ifndef __cplusplus
+#error("This file should be compiled with C++ compiler")
+#endif
 #include "stream.h"
 enum MAAT_CHARSET
 {