diff --git a/Lib/dummy_thread.py b/Lib/dummy_thread.py
index fb3abbf75d0..d69d84053d8 100644
--- a/Lib/dummy_thread.py
+++ b/Lib/dummy_thread.py
@@ -113,6 +113,14 @@ def acquire(self, waitflag=None):
             self.locked_status = True
             return True
 
+    __enter__ = acquire
+
+    def __exit__(self, typ, val, tb):
+        self.release()
+
+    def __context__(self):
+        return self
+
     def release(self):
         """Release the dummy lock."""
         # XXX Perhaps shouldn't actually bother to test?  Could lead