diff --git a/turtle/log.hpp b/turtle/log.hpp
index 15d9118..4207eb5 100644
--- a/turtle/log.hpp
+++ b/turtle/log.hpp
@@ -139,8 +139,8 @@ namespace detail
     {
         return s << mock::format( t.lock() );
     }
-    template< typename T, typename Deleter >
-    inline stream& operator<<( stream& s, const std::unique_ptr< T, Deleter >& p )
+    template< typename T, typename D >
+    inline stream& operator<<( stream& s, const std::unique_ptr< T, D >& p )
     {
         return s << mock::format( p.get() );
     }