diff --git a/include/openPMD/backend/Container.hpp b/include/openPMD/backend/Container.hpp
index 58b07bd48a..cee50f9baf 100644
--- a/include/openPMD/backend/Container.hpp
+++ b/include/openPMD/backend/Container.hpp
@@ -259,7 +259,7 @@ class Container : virtual public Attributable
 
     void swap(Container &other)
     {
-        container().swap(other.m_container);
+        container().swap(other.container());
     }
 
     mapped_type &at(key_type const &key)