diff --git a/irssi-config.h b/irssi-config.h
index 0597736..da8f82a 100644
--- a/irssi-config.h
+++ b/irssi-config.h
@@ -1,3 +1,7 @@
-#include <bits/wordsize.h>
+#ifndef IRSSI_CONFIG_H
+#define IRSSI_CONFIG_H
 
+#include <bits/wordsize.h>
 #include "irssi-config-64.h"
+
+#endif