diff --git a/lib/sql_implementation.ex b/lib/sql_implementation.ex
index 509890e..11fd5e0 100644
--- a/lib/sql_implementation.ex
+++ b/lib/sql_implementation.ex
@@ -168,6 +168,10 @@ defmodule AshSqlite.SqlImplementation do
     type
   end
 
+  def parameterized_type({:parameterized, _} = type, _, _) do
+    type
+  end
+
   def parameterized_type({:in, type}, constraints, no_maps?) do
     parameterized_type({:array, type}, constraints, no_maps?)
   end
@@ -202,7 +206,7 @@ defmodule AshSqlite.SqlImplementation do
       end
     else
       if is_atom(type) && :erlang.function_exported(type, :type, 1) do
-        {:parameterized, type, constraints || []}
+        Ecto.ParameterizedType.init(type, constraints)
       else
         type
       end
@@ -314,7 +318,7 @@ defmodule AshSqlite.SqlImplementation do
     else
       type =
         if is_atom(type) && :erlang.function_exported(type, :type, 1) do
-          {:parameterized, type, []} |> array_to_in()
+          parameterized_type(type, constraints, true) |> array_to_in()
         else
           type |> array_to_in()
         end
@@ -333,9 +337,6 @@ defmodule AshSqlite.SqlImplementation do
 
   defp array_to_in({:array, v}), do: {:in, array_to_in(v)}
 
-  defp array_to_in({:parameterized, type, constraints}),
-    do: {:parameterized, array_to_in(type), constraints}
-
   defp array_to_in(v), do: v
 
   defp vagueness({:in, type}), do: vagueness(type)
diff --git a/lib/types/types.ex b/lib/types/types.ex
index 63c5f3e..58cf905 100644
--- a/lib/types/types.ex
+++ b/lib/types/types.ex
@@ -7,6 +7,10 @@ defmodule AshSqlite.Types do
     type
   end
 
+  def parameterized_type({:parameterized, _} = type, _) do
+    type
+  end
+
   def parameterized_type({:in, type}, constraints) do
     parameterized_type({:array, type}, constraints)
   end
@@ -40,7 +44,7 @@ defmodule AshSqlite.Types do
       end
     else
       if is_atom(type) && :erlang.function_exported(type, :type, 1) do
-        {:parameterized, type, constraints || []}
+        parameterized_type(type, constraints || [])
       else
         type
       end
@@ -151,7 +155,7 @@ defmodule AshSqlite.Types do
     else
       type =
         if is_atom(type) && :erlang.function_exported(type, :type, 1) do
-          {:parameterized, type, []} |> array_to_in()
+          parameterized_type(type, []) |> array_to_in()
         else
           type |> array_to_in()
         end
@@ -170,9 +174,6 @@ defmodule AshSqlite.Types do
 
   defp array_to_in({:array, v}), do: {:in, array_to_in(v)}
 
-  defp array_to_in({:parameterized, type, constraints}),
-    do: {:parameterized, array_to_in(type), constraints}
-
   defp array_to_in(v), do: v
 
   defp vagueness({:in, type}), do: vagueness(type)