diff --git a/drd/drd_mutex.c b/drd/drd_mutex.c
index 65cf04632..cf5a4a86e 100644
--- a/drd/drd_mutex.c
+++ b/drd/drd_mutex.c
@@ -464,6 +464,8 @@ const char* DRD_(mutex_type_name)(const MutexT mt)
       return "mutex";
    case mutex_type_spinlock:
       return "spinlock";
+   case mutex_type_order_annotation:
+      return "order annotation mutex";
    default:
       tl_assert(0);
    }