diff --git a/CHANGELOG.md b/CHANGELOG.md
index 507f5341..47bb98f3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,15 +21,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fixes #455, reported by @Klavionik. This error caused the WebSocket handler
   to erroneously return an instance of BlackSheep response to the underlying
   ASGI server, causing an error to be logged in the console.
-- Update type annotations in the `Application` class code to be more explicit
+- Updates type annotations in the `Application` class code to be more explicit
   about the fact that certain methods must return None (return in __call__ is
   used to interrupt code execution and not to return objects).
-- Improve the normalization logic to not normalize the output for WebSocket
+- Improves the normalization logic to not normalize the output for WebSocket
   requests (as ASGI servers do not allow controlling the response for WebSocket
   handshake requests).
-- Improve the normalization logic to not normalize request handlers that are
+- Improves the normalization logic to not normalize request handlers that are
   valid as they are, as asynchronous functions with a single parameter
   annotated as Request or WebSocket.
+- Fixes #421 reported by @mohd-akram, causing handled exceptions to be logged
+  like unhandled, when defining exception handlers using subclasses.
+- Removes wrong type annotations in two functions in `blacksheep.utils`.
 
 ## [2.0.3] - 2023-12-18 :gift:
 
diff --git a/blacksheep/baseapp.pxd b/blacksheep/baseapp.pxd
index f8e8fdb5..373b5a30 100644
--- a/blacksheep/baseapp.pxd
+++ b/blacksheep/baseapp.pxd
@@ -15,3 +15,4 @@ cdef class BaseApplication:
     cdef public dict exceptions_handlers
     cdef object get_http_exception_handler(self, HTTPException http_exception)
     cdef object get_exception_handler(self, Exception exception)
+    cdef bint is_handled_exception(self, Exception exception)
diff --git a/blacksheep/baseapp.pyx b/blacksheep/baseapp.pyx
index ddc0bb9c..60a8a6e1 100644
--- a/blacksheep/baseapp.pyx
+++ b/blacksheep/baseapp.pyx
@@ -96,7 +96,7 @@ cdef class BaseApplication:
             await self.log_handled_exc(request, exc)
             return await self.handle_http_exception(request, exc)
 
-        if type(exc) in self.exceptions_handlers:
+        if self.is_handled_exception(exc):
             await self.log_handled_exc(request, exc)
         else:
             await self.log_unhandled_exc(request, exc)
@@ -109,6 +109,12 @@ cdef class BaseApplication:
         except KeyError:
             return self.exceptions_handlers.get(http_exception.status, common_http_exception_handler)
 
+    cdef bint is_handled_exception(self, Exception exception):
+        for current_class_in_hierarchy in get_class_instance_hierarchy(exception):
+            if current_class_in_hierarchy in self.exceptions_handlers:
+                return True
+        return False
+
     cdef object get_exception_handler(self, Exception exception):
         for current_class_in_hierarchy in get_class_instance_hierarchy(exception):
             if current_class_in_hierarchy in self.exceptions_handlers:
diff --git a/blacksheep/utils/__init__.py b/blacksheep/utils/__init__.py
index 59ce6616..b2484c75 100644
--- a/blacksheep/utils/__init__.py
+++ b/blacksheep/utils/__init__.py
@@ -1,5 +1,5 @@
 import re
-from typing import AnyStr, Tuple, Type, TypeVar
+from typing import AnyStr, Type, TypeVar
 
 T = TypeVar("T")
 
@@ -31,11 +31,11 @@ def join_fragments(*args: AnyStr) -> str:
     )
 
 
-def get_class_hierarchy(cls: Type[T]) -> Tuple[Type[T], ...]:
+def get_class_hierarchy(cls: Type[T]):
     return cls.__mro__
 
 
-def get_class_instance_hierarchy(instance: T) -> Tuple[Type[T], ...]:
+def get_class_instance_hierarchy(instance: T):
     return get_class_hierarchy(type(instance))