diff --git a/source3/rpc_server/rpcd_mdssvc.c b/source3/rpc_server/rpcd_mdssvc.c
index c5b632099fa0..4040ae9e0d81 100644
--- a/source3/rpc_server/rpcd_mdssvc.c
+++ b/source3/rpc_server/rpcd_mdssvc.c
@@ -16,6 +16,7 @@
  */
 
 #include "includes.h"
+#include "source3/locking/proto.h"
 #include "rpc_worker.h"
 #include "librpc/gen_ndr/ndr_mdssvc.h"
 #include "librpc/gen_ndr/ndr_mdssvc_scompat.h"
@@ -38,9 +39,16 @@ static size_t mdssvc_servers(
 	void *private_data)
 {
 	static const struct dcesrv_endpoint_server *ep_servers[1] = { NULL };
+	bool ok;
 
 	lp_load_with_shares(get_dyn_CONFIGFILE());
 
+	ok = posix_locking_init(false);
+	if (!ok) {
+		DBG_ERR("posix_locking_init() failed\n");
+		exit(1);
+	}
+
 	ep_servers[0] = mdssvc_get_ep_server();
 
 	*_ep_servers = ep_servers;