diff --git a/lib/acx/enforcer.ex b/lib/acx/enforcer.ex
index dc836d4..9385d69 100644
--- a/lib/acx/enforcer.ex
+++ b/lib/acx/enforcer.ex
@@ -475,7 +475,7 @@ defmodule Acx.Enforcer do
        when is_atom(mapping_name) and is_binary(role1) and is_binary(role2) and is_binary(dom) do
     with group when not is_nil(group) <- Map.get(groups, mapping_name),
          false <- Enum.member?(mappings, mapping),
-         group <- RoleGroup.add_inheritance(group, {role1, role2 <> dom}) do
+         group <- RoleGroup.add_inheritance(group, {{role1, dom}, {role2, dom}}) do
       new_enforcer = %{
         enforcer
         | role_groups: %{groups | mapping_name => group},
@@ -720,7 +720,7 @@ defmodule Acx.Enforcer do
       )
       when is_atom(mapping_name) and is_binary(role1) and is_binary(role2) and is_binary(dom) do
     with group when not is_nil(group) <- Map.get(groups, mapping_name),
-         group <- RoleGroup.remove_inheritance(group, {role1, role2 <> dom}),
+         group <- RoleGroup.remove_inheritance(group, {{role1, dom}, {role2, dom}}),
          mappings <- Enum.reject(mappings, fn m -> m == mapping end),
          {:ok, _adpater} <-
            PersistAdapter.remove_policy(adapter, {mapping_name, [role1, role2, dom]}) do
diff --git a/lib/acx/internal/role_group.ex b/lib/acx/internal/role_group.ex
index e7cc63c..02841e4 100644
--- a/lib/acx/internal/role_group.ex
+++ b/lib/acx/internal/role_group.ex
@@ -145,9 +145,9 @@ defmodule Acx.Internal.RoleGroup do
       ...> false = f.(1, 2)
       ...> f.("admin", "member")
       true
-      ...> g = g |> RoleGroup.add_inheritance({"admin", "memberdomain"})
+      ...> g = g |> RoleGroup.add_inheritance({{"admin", "domain"}, {"member", "domain"}})
       ...> f = g |> RoleGroup.stub_3
-      ...> false = f.("member", "admin", "dom")
+      ...> false = f.("member", "admin", "domain")
       ...> f.("admin", "member", "domain")
       true
   """
@@ -161,7 +161,7 @@ defmodule Acx.Internal.RoleGroup do
   def stub_3(%__MODULE__{} = group) do
     fn
       arg1, arg2, arg3 ->
-        group |> inherit_from?(arg1, arg2 <> arg3)
+        group |> inherit_from?({arg1, arg3}, {arg2, arg3})
     end
   end
 end