diff --git a/flama/http.py b/flama/http.py
index 649dbe47..79705154 100644
--- a/flama/http.py
+++ b/flama/http.py
@@ -15,9 +15,7 @@
 import starlette.responses
 import starlette.schemas
 
-import flama.types
-from flama import schemas, types
-from flama.exceptions import HTTPException, SerializationError
+from flama import exceptions, schemas, types
 
 if sys.version_info < (3, 11):  # PORT: Remove when stop supporting 3.10 # pragma: no cover
 
@@ -59,11 +57,17 @@ async def __call__(  # type: ignore[override]
 
 
 class HTMLResponse(starlette.responses.HTMLResponse, Response):
-    __call__ = Response.__call__  # type: ignore[assignment]
+    async def __call__(  # type: ignore[override]
+        self, scope: types.Scope, receive: types.Receive, send: types.Send
+    ) -> None:
+        await super().__call__(scope, receive, send)  # type: ignore[arg-type]
 
 
 class PlainTextResponse(starlette.responses.PlainTextResponse, Response):
-    __call__ = Response.__call__  # type: ignore[assignment]
+    async def __call__(  # type: ignore[override]
+        self, scope: types.Scope, receive: types.Receive, send: types.Send
+    ) -> None:
+        await super().__call__(scope, receive, send)  # type: ignore[arg-type]
 
 
 class EnhancedJSONEncoder(json.JSONEncoder):
@@ -107,6 +111,11 @@ def default(self, o):
 
 
 class JSONResponse(starlette.responses.JSONResponse, Response):
+    async def __call__(  # type: ignore[override]
+        self, scope: types.Scope, receive: types.Receive, send: types.Send
+    ) -> None:
+        await super().__call__(scope, receive, send)  # type: ignore[arg-type]
+
     def render(self, content: t.Any) -> bytes:
         if isinstance(content, types.Schema):
             content = dict(content)
@@ -117,15 +126,24 @@ def render(self, content: t.Any) -> bytes:
 
 
 class RedirectResponse(starlette.responses.RedirectResponse, Response):
-    __call__ = Response.__call__  # type: ignore[assignment]
+    async def __call__(  # type: ignore[override]
+        self, scope: types.Scope, receive: types.Receive, send: types.Send
+    ) -> None:
+        await super().__call__(scope, receive, send)  # type: ignore[arg-type]
 
 
 class StreamingResponse(starlette.responses.StreamingResponse, Response):
-    __call__ = Response.__call__  # type: ignore[assignment]
+    async def __call__(  # type: ignore[override]
+        self, scope: types.Scope, receive: types.Receive, send: types.Send
+    ) -> None:
+        await super().__call__(scope, receive, send)  # type: ignore[arg-type]
 
 
 class FileResponse(starlette.responses.FileResponse, Response):
-    __call__ = Response.__call__  # type: ignore[assignment]
+    async def __call__(  # type: ignore[override]
+        self, scope: types.Scope, receive: types.Receive, send: types.Send
+    ) -> None:
+        await super().__call__(scope, receive, send)  # type: ignore[arg-type]
 
 
 class APIResponse(JSONResponse):
@@ -140,7 +158,7 @@ def render(self, content: t.Any):
             try:
                 content = schemas.Schema.from_type(self.schema).dump(content)
             except schemas.SchemaValidationError as e:
-                raise SerializationError(status_code=500, detail=e.errors)
+                raise exceptions.SerializationError(status_code=500, detail=e.errors)
 
         if not content:
             return b""
@@ -179,7 +197,7 @@ def __init__(self, path: str, *args, **kwargs):
             with open(path) as f:
                 content = f.read()
         except Exception as e:
-            raise HTTPException(status_code=500, detail=str(e))
+            raise exceptions.HTTPException(status_code=500, detail=str(e))
 
         super().__init__(content, *args, **kwargs)
 
@@ -213,7 +231,7 @@ def __init__(self, *args, **kwargs):
 
         self.filters["safe_json"] = self.safe_json
 
-    def _escape(self, value: flama.types.JSONField) -> flama.types.JSONField:
+    def _escape(self, value: types.JSONField) -> types.JSONField:
         if isinstance(value, (list, tuple)):
             return [self._escape(x) for x in value]
 
@@ -225,7 +243,7 @@ def _escape(self, value: flama.types.JSONField) -> flama.types.JSONField:
 
         return value
 
-    def safe_json(self, value: flama.types.JSONField):
+    def safe_json(self, value: types.JSONField):
         return json.dumps(self._escape(value)).replace('"', '\\"')
 
 
@@ -237,7 +255,12 @@ class _ReactTemplateResponse(HTMLTemplateResponse):
     )
 
 
-class OpenAPIResponse(Response, starlette.schemas.OpenAPIResponse):
+class OpenAPIResponse(starlette.schemas.OpenAPIResponse, Response):
+    async def __call__(  # type: ignore[override]
+        self, scope: types.Scope, receive: types.Receive, send: types.Send
+    ) -> None:
+        await super().__call__(scope, receive, send)  # type: ignore[arg-type]
+
     def render(self, content: t.Any) -> bytes:
         assert isinstance(content, dict), "The schema passed to OpenAPIResponse should be a dictionary."