diff --git a/servers/slapd/schema_init.c b/servers/slapd/schema_init.c
index 883e6a6da5..30830cdb12 100644
--- a/servers/slapd/schema_init.c
+++ b/servers/slapd/schema_init.c
@@ -8,6 +8,7 @@
 #include "portable.h"
 
 #include <stdio.h>
+#include <limits.h>
 
 #include <ac/ctype.h>
 #include <ac/errno.h>