diff --git a/telebot/util.py b/telebot/util.py
index 49ea25d..711f003 100644
--- a/telebot/util.py
+++ b/telebot/util.py
@@ -420,7 +420,7 @@ def generate_random_token():
     return ''.join(random.sample(string.ascii_letters, 16))
 
 
-def deprecated_dec(warn: bool=False, alternative: Optional[Callable]=None):
+def deprecated(warn: bool=False, alternative: Optional[Callable]=None):
     """
     Use this decorator to mark functions as deprecated.
     When the function is used, an info (or warning if `warn` is True) is logged.
@@ -439,18 +439,3 @@ def deprecated_dec(warn: bool=False, alternative: Optional[Callable]=None):
         return wrapper
     return decorator
 
-
-def deprecated(func):
-    """This is a decorator which can be used to mark functions
-    as deprecated. It will result in a warning being emitted
-    when the function is used."""
-    # https://stackoverflow.com/a/30253848/441814
-    @functools.wraps(func)
-    def new_func(*args, **kwargs):
-        warnings.simplefilter('always', DeprecationWarning)  # turn off filter
-        warnings.warn("Call to deprecated function {}.".format(func.__name__),
-                      category=DeprecationWarning,
-                      stacklevel=2)
-        warnings.simplefilter('default', DeprecationWarning)  # reset filter
-        return func(*args, **kwargs)
-    return new_func
diff --git a/tests/test_telebot.py b/tests/test_telebot.py
index a2f3d36..0421033 100644
--- a/tests/test_telebot.py
+++ b/tests/test_telebot.py
@@ -19,6 +19,14 @@ if not should_skip:
     CHAT_ID = os.environ['CHAT_ID']
     GROUP_ID = os.environ['GROUP_ID']
 
+def _new_test():
+    pass
+
+@util.deprecated(alternative=_new_test)
+def _test():
+    pass
+        
+
 
 @pytest.mark.skipif(should_skip, reason="No environment variables configured")
 class TestTeleBot:
@@ -605,6 +613,9 @@ class TestTeleBot:
         tb.process_new_updates([update])
         time.sleep(1)
         assert update.message.text == 'got' * 2
+    
+    def test_deprecated_dec(self):
+        _test()
 
     def test_chat_permissions(self):
         return # CHAT_ID is private chat, no permissions can be set