diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index a48153a..210b916 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -31,6 +31,9 @@ Fix
   For more information, see `The Warning Filter <https://docs.python.org/3/library/warnings.html#the-warnings-filter>`_
   in the Python documentation.
 
+- Fix #13: Warning displays the correct filename and line number when decorating a class if wrapt
+  does not have the compiled c extension.
+
 Documentation
 -------------
 
@@ -55,7 +58,7 @@ Bug fix release
 Fix
 ---
 
-- Warning displays the correct filename and line number when decorating a function if wrapt
+- Fix #13: Warning displays the correct filename and line number when decorating a function if wrapt
   does not have the compiled c extension.
 
 Other
diff --git a/deprecated/classic.py b/deprecated/classic.py
index 1dfd23e..bbdce5a 100644
--- a/deprecated/classic.py
+++ b/deprecated/classic.py
@@ -18,11 +18,11 @@
     # stack level that should be passed to warnings.warn should be 2. However, if using
     # a pure python wrapt, a extra stacklevel is required.
     import wrapt._wrappers
+
     _stacklevel = 2
 except ImportError:
     _stacklevel = 3
 
-
 string_types = (type(b''), type(u''))
 
 
@@ -158,7 +158,7 @@ def wrapped_cls(cls, *args, **kwargs):
                 with warnings.catch_warnings():
                     if self.action:
                         warnings.simplefilter(self.action, self.category)
-                    warnings.warn(msg, category=self.category, stacklevel=2)
+                    warnings.warn(msg, category=self.category, stacklevel=_stacklevel)
                 if old_new1 is object.__new__:
                     return old_new1(cls)
                 # actually, we don't know the real signature of *old_new1*