diff --git a/tiramisu/__init__.py b/tiramisu/__init__.py
index d317aa4..a83f3fc 100644
--- a/tiramisu/__init__.py
+++ b/tiramisu/__init__.py
@@ -45,4 +45,4 @@ allfuncs.extend(all_options)
 del(all_options)
 __all__ = tuple(allfuncs)
 del(allfuncs)
-__version__ = "3.0rc12"
+__version__ = "3.0rc13"
diff --git a/tiramisu/config.py b/tiramisu/config.py
index 7943abc..270df47 100644
--- a/tiramisu/config.py
+++ b/tiramisu/config.py
@@ -692,8 +692,8 @@ class _CommonConfig(SubConfig):
             child.parents.append(weakref.ref(duplicated_config))
         if self.parents:
             if deep:
-                if metaconfig_prefix is not None and self._impl_path is not None:
-                    metaconfig_prefix += self._impl_path
+                if metaconfig_prefix is not None:
+                    metaconfig_prefix += self.impl_getname()
                 for parent in self.parents:
                     duplicated_config = parent().duplicate(deep=deep,
                                                            storage=storage,