diff --git a/Lib/dummy_thread.py b/Lib/dummy_thread.py
index c1313846e48..16dcf7e9a2c 100644
--- a/Lib/dummy_thread.py
+++ b/Lib/dummy_thread.py
@@ -104,18 +104,15 @@ class LockType(object):
         aren't triggered and throw a little fit.
 
         """
-        if waitflag is None:
+        if waitflag is None or waitflag:
             self.locked_status = True
-            return None
-        elif not waitflag:
+            return True
+        else:
             if not self.locked_status:
                 self.locked_status = True
                 return True
             else:
                 return False
-        else:
-            self.locked_status = True
-            return True
 
     __enter__ = acquire
 
diff --git a/Lib/test/test_dummy_thread.py b/Lib/test/test_dummy_thread.py
index f274e0a0d0f..58faeb42892 100644
--- a/Lib/test/test_dummy_thread.py
+++ b/Lib/test/test_dummy_thread.py
@@ -60,6 +60,7 @@ class LockTests(unittest.TestCase):
         #Make sure that an unconditional locking returns True.
         self.failUnless(self.lock.acquire(1) is True,
                         "Unconditional locking did not return True.")
+        self.failUnless(self.lock.acquire() is True)
 
     def test_uncond_acquire_blocking(self):
         #Make sure that unconditional acquiring of a locked lock blocks.
diff --git a/Misc/NEWS b/Misc/NEWS
index f026a09bbfb..ecd5567c0a5 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,7 +10,6 @@ What's New in Python 2.6 beta 2?
 Core and Builtins
 -----------------
 
-
 - Issue #2517: Allow unicode messages in Exceptions again by correctly
   bypassing the instance dictionary when looking up __unicode__ on
   new-style classes.
@@ -41,6 +40,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #3339: dummy_thread.acquire() should not return None.
+
 - Issue #3285: Fractions from_float() and from_decimal() accept Integral arguments.
 
 - Issue #3301: Bisect module behaved badly when lo was negative.