diff --git a/include/corosync/engine/objdb.h b/include/corosync/engine/objdb.h
index afd3c636..c70ea406 100644
--- a/include/corosync/engine/objdb.h
+++ b/include/corosync/engine/objdb.h
@@ -63,9 +63,9 @@ typedef void (*object_key_change_notify_fn_t)(
 	object_change_type_t change_type,
 	hdb_handle_t parent_object_handle,
 	hdb_handle_t object_handle,
-	void *object_name_pt, int object_name_len,
-	void *key_name_pt, int key_len,
-	void *key_value_pt, int key_value_len,
+	const void *object_name_pt, int object_name_len,
+	const void *key_name_pt, int key_len,
+	const void *key_value_pt, int key_value_len,
 void *priv_data_pt);
 
 typedef void (*object_create_notify_fn_t) (unsigned int parent_object_handle,