diff --git a/tests/c++.at b/tests/c++.at
index a7878650..d708a5ba 100644
--- a/tests/c++.at
+++ b/tests/c++.at
@@ -770,6 +770,12 @@ $1
       Object::instances.erase (i);
     }
 
+    Object& operator= (const Object& that)
+    {
+      val = that.val;
+      return *this;
+    }
+
     Object& operator= (char v)
     {
       val = v;