diff --git a/lib/krb5/krb5_locl.h b/lib/krb5/krb5_locl.h
index 968a021b4..c4dfa9ad3 100644
--- a/lib/krb5/krb5_locl.h
+++ b/lib/krb5/krb5_locl.h
@@ -148,6 +148,12 @@ struct krb5_dh_moduli;
 /* v4 glue */
 struct _krb5_krb_auth_data;
 
+struct krb5_plugin;
+enum plugin_type {
+    PLUGIN_TYPE_DATA = 1,
+    PLUGIN_TYPE_FUNC
+};
+
 #include <der.h>
 
 #include <krb5.h>