diff --git a/radsecproxy.h b/radsecproxy.h
index 8dfd064..18a8702 100644
--- a/radsecproxy.h
+++ b/radsecproxy.h
@@ -152,7 +152,7 @@ struct clsrvconf {
     regex_t *certcnregex;
     regex_t *certuriregex;
     regex_t *certdnsregex;
-    in6_addr_t certipmatch;
+    struct in6_addr certipmatch;
     int certipmatchaf;
     char *confrewritein;
     char *confrewriteout;