diff --git a/tests/stdlib/test_thread__boundedsem.py b/tests/stdlib/test_thread__boundedsem.py
index c1ca7c7..c530c61 100644
--- a/tests/stdlib/test_thread__boundedsem.py
+++ b/tests/stdlib/test_thread__boundedsem.py
@@ -5,8 +5,14 @@ from eventlet.green import thread
 def allocate_lock():
     return coros.semaphore(1, 9999)
 
+original_allocate_lock = thread.allocate_lock
 thread.allocate_lock = allocate_lock
+original_LockType = thread.LockType
 thread.LockType = coros.BoundedSemaphore
 
-import os.path
-execfile(os.path.join(os.path.dirname(__file__), 'test_thread.py'))
+try:
+    import os.path
+    execfile(os.path.join(os.path.dirname(__file__), 'test_thread.py'))
+finally:
+    thread.allocate_lock = original_allocate_lock
+    thread.LockType = original_LockType