diff --git a/src/include/config.h b/src/include/config.h
index b1f715a968f2ab36815f24a54acd26425e7fb675..b76624963d137df6582eba719f523e0b2a77c4b5 100644
--- a/src/include/config.h
+++ b/src/include/config.h
@@ -4,6 +4,9 @@
    eventual use of autoconf to build the server 
 */
 
+#ifndef CONFIG_H
+#define CONFIG_H
+
 #define BLCKSZ	8192
 
 
@@ -60,4 +63,5 @@
 /*------------------------------------------------------*/
 /* #define UNSAFE_FLOATS */
 
+#endif /* CONFIG_H */