diff --git a/src/include/config.h b/src/include/config.h
index b1f715a968f..b76624963d1 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 */