diff --git a/plugins/include/functions.inc b/plugins/include/functions.inc
index 6c4198a6..8434c4f7 100644
--- a/plugins/include/functions.inc
+++ b/plugins/include/functions.inc
@@ -30,6 +30,11 @@
  * Version: $Id$
  */
  
+#if defined _functions_included
+ #endinput
+#endif
+#define _functions_included
+ 
 #define SP_PARAMFLAG_BYREF	(1<<0)	/**< Internal use only. */
 
 /**