diff --git a/lib/open_api_spex/cast/all_of.ex b/lib/open_api_spex/cast/all_of.ex
index e0f49ced..a71e977f 100644
--- a/lib/open_api_spex/cast/all_of.ex
+++ b/lib/open_api_spex/cast/all_of.ex
@@ -6,7 +6,7 @@ defmodule OpenApiSpex.Cast.AllOf do
 
   def cast(ctx), do: cast_all_of(ctx, nil)
 
-  defp cast_all_of(%{schema: %{allOf: [%Schema{} = schema | remaining]}} = ctx, acc) do
+  defp cast_all_of(%Cast{schema: %{allOf: [%Schema{} = schema | remaining]}} = ctx, acc) do
     relaxed_schema = %{schema | "x-struct": nil}
     new_ctx = put_in(ctx.schema.allOf, remaining)
 
@@ -23,7 +23,7 @@ defmodule OpenApiSpex.Cast.AllOf do
 
       {:error, errors} ->
         Cast.error(
-          %Cast{ctx | errors: ctx.errors ++ errors},
+          %{ctx | errors: ctx.errors ++ errors},
           {:all_of, to_string(relaxed_schema.title || relaxed_schema.type)}
         )
     end
diff --git a/lib/open_api_spex/cast/any_of.ex b/lib/open_api_spex/cast/any_of.ex
index 334cf0a2..9d870a05 100644
--- a/lib/open_api_spex/cast/any_of.ex
+++ b/lib/open_api_spex/cast/any_of.ex
@@ -12,7 +12,7 @@ defmodule OpenApiSpex.Cast.AnyOf do
   end
 
   defp cast_any_of(
-         %{schema: %{anyOf: [%Schema{} = schema | remaining]}} = ctx,
+         %Cast{schema: %{anyOf: [%Schema{} = schema | remaining]}} = ctx,
          failed_schemas,
          acc
        ) do
@@ -32,7 +32,7 @@ defmodule OpenApiSpex.Cast.AnyOf do
 
       {:error, errors} ->
         cast_any_of(
-          %Cast{new_ctx | errors: new_ctx.errors ++ errors},
+          %{new_ctx | errors: new_ctx.errors ++ errors},
           [schema | failed_schemas],
           acc
         )
diff --git a/lib/open_api_spex/cast/one_of.ex b/lib/open_api_spex/cast/one_of.ex
index 9fa37b53..fc4fdac8 100644
--- a/lib/open_api_spex/cast/one_of.ex
+++ b/lib/open_api_spex/cast/one_of.ex
@@ -8,7 +8,7 @@ defmodule OpenApiSpex.Cast.OneOf do
     error(ctx, [], [])
   end
 
-  def cast(%{schema: %{type: _, oneOf: schemas}} = ctx) do
+  def cast(%Cast{schema: %{type: _, oneOf: schemas}} = ctx) do
     castable_schemas =
       Enum.reduce(schemas, {ctx, [], []}, fn schema, {ctx, results, error_schemas} ->
         schema = OpenApiSpex.resolve_schema(schema, ctx.schemas)
@@ -19,7 +19,7 @@ defmodule OpenApiSpex.Cast.OneOf do
           {ctx, [{:ok, value, schema} | results], error_schemas}
         else
           {:error, errors} ->
-            {%Cast{ctx | errors: ctx.errors ++ errors}, results, [schema | error_schemas]}
+            {%{ctx | errors: ctx.errors ++ errors}, results, [schema | error_schemas]}
         end
       end)