diff --git a/src/misc/bitvect.hh b/src/misc/bitvect.hh
index c1a44c89a..2342bf993 100644
--- a/src/misc/bitvect.hh
+++ b/src/misc/bitvect.hh
@@ -453,11 +453,8 @@ namespace spot
     {
     }
 
-    /// Not implemented.
-    SPOT_LOCAL bitvect_array(const bitvect_array&);
-    /// Not implemented.
-    SPOT_LOCAL void operator=(const bitvect_array&);
-
+    SPOT_LOCAL bitvect_array(const bitvect_array&) SPOT_DELETED;
+    SPOT_LOCAL void operator=(const bitvect_array&) SPOT_DELETED;
 
   public:
     ~bitvect_array()