diff --git a/include/re.h b/include/re.h
index 4aa80ef..095b9bb 100644
--- a/include/re.h
+++ b/include/re.h
@@ -4,6 +4,9 @@
  * Copyright (C) 2010 Creytiv.com
  */
 
+#ifndef RE_H__
+#define RE_H__
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -52,3 +55,5 @@ extern "C" {
 #ifdef __cplusplus
 }
 #endif
+
+#endif