diff --git a/test/test_contained_class.cpp b/test/test_contained_class.cpp
index d67fe588..7fe4b4db 100644
--- a/test/test_contained_class.cpp
+++ b/test/test_contained_class.cpp
@@ -41,6 +41,7 @@ public:
     {
         return b == rhs.b;
     }
+    C(){}
 };
 
 int test_main( int /* argc */, char* /* argv */[] )