diff --git a/lib/boundary/checker.ex b/lib/boundary/checker.ex
index 7e6654d..f1c8e5e 100644
--- a/lib/boundary/checker.ex
+++ b/lib/boundary/checker.ex
@@ -127,8 +127,14 @@ defmodule Boundary.Checker do
         |> Stream.take_while(&(not is_nil(&1)))
         |> Enum.find(&(Enum.at(&1.ancestors, 0) == boundary.name))
         |> case do
-          nil -> false
-          child_subboundary -> export in [child_subboundary.name | child_subboundary.exports]
+          nil ->
+            false
+
+          %{exports: [{_, []}]} = child_subboundary ->
+            String.starts_with?(to_string(export), to_string(child_subboundary.name))
+
+          child_subboundary ->
+            export in [child_subboundary.name | child_subboundary.exports]
         end
     end
   end
@@ -331,10 +337,6 @@ defmodule Boundary.Checker do
 
   defp export_matches?(_view, _boundary, module, module), do: true
 
-  defp export_matches?(_view, _boundary, {root, []}, module) do
-    String.starts_with?(to_string(module), to_string(root))
-  end
-
   defp export_matches?(view, boundary, {root, opts}, module) do
     String.starts_with?(to_string(module), to_string(root)) and
       not Enum.any?(Keyword.get(opts, :except, []), &(Module.concat(root, &1) == module)) and
diff --git a/test/mix/tasks/compile/boundary_test.exs b/test/mix/tasks/compile/boundary_test.exs
index 782fe3d..8329b44 100644
--- a/test/mix/tasks/compile/boundary_test.exs
+++ b/test/mix/tasks/compile/boundary_test.exs
@@ -1154,14 +1154,16 @@ defmodule Mix.Tasks.Compile.BoundaryTest do
 
                 defmodule Schemas.Foo do def fun(), do: :ok end
                 defmodule Schemas.Bar do def fun(), do: :ok end
-              end
 
-              defmodule #{module1}.Subdomain do
-                use Boundary, exports: :all
-              end
+                defmodule Subdomain do
+                  use Boundary, exports: :all
 
-              defmodule #{module1}.Subdomain.Module do
-                def fun(), do: :ok
+                  def fun(), do: :ok
+
+                  defmodule Module do
+                    def fun(), do: :ok
+                  end
+                end
               end
 
               defmodule #{module2} do
@@ -1171,6 +1173,7 @@ defmodule Mix.Tasks.Compile.BoundaryTest do
                   #{module1}.Schemas.Foo.fun()
                   #{module1}.Schemas.Bar.fun()
                   #{module1}.Schemas.Base.fun()
+                  #{module1}.Subdomain.fun()
                   #{module1}.Subdomain.Module.fun()
                 end
               end