diff --git a/kdc/headers.h b/kdc/headers.h
index 521856269..faf1c9d8c 100644
--- a/kdc/headers.h
+++ b/kdc/headers.h
@@ -41,6 +41,7 @@
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
+#include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>