diff --git a/include/etl/null_type.h b/include/etl/null_type.h
index 6b610ced..3dd8b096 100644
--- a/include/etl/null_type.h
+++ b/include/etl/null_type.h
@@ -37,11 +37,6 @@ namespace etl
   template <size_t N>
   class null_type
   {
-  private:
-
-    null_type();
-    null_type(const null_type&);
-    null_type& operator=(const null_type&);
   };
 }