diff --git a/func_timeout/__init__.py b/func_timeout/__init__.py
index ff05ee9..00b1214 100644
--- a/func_timeout/__init__.py
+++ b/func_timeout/__init__.py
@@ -9,7 +9,8 @@
 __version__ = '4.2.0'
 __version_tuple__ = (4, 2, 0)
 
-__all__ = ('func_timeout', 'func_set_timeout', 'FunctionTimedOut')
+__all__ = ('func_timeout', 'func_set_timeout', 'FunctionTimedOut', 'StoppableThread')
 
 from .exceptions import FunctionTimedOut
 from .dafunc import func_timeout, func_set_timeout
+from .StoppableThread import StoppableThread