diff --git a/Misc/NEWS b/Misc/NEWS
index b3a56b0a3c4..0af2c80fbaa 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -103,6 +103,9 @@ Core and builtins
 Extension Modules
 -----------------
 
+- Bug #1234979: For the argument of thread.Lock.acquire, the Windows 
+  implemented treated all integer values except 1 as false.
+
 - Bug #1194181: bz2.BZ2File didn't handle mode 'U' correctly.
 
 - Patch #1212117: os.stat().st_flags is now accessible as a attribute
diff --git a/Python/thread_nt.h b/Python/thread_nt.h
index 7d2290e6b88..47c776f0808 100644
--- a/Python/thread_nt.h
+++ b/Python/thread_nt.h
@@ -299,7 +299,7 @@ int PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
 
 	dprintf(("%ld: PyThread_acquire_lock(%p, %d) called\n", PyThread_get_thread_ident(),aLock, waitflag));
 
-	success = aLock && EnterNonRecursiveMutex((PNRMUTEX) aLock, (waitflag == 1 ? INFINITE : 0)) == WAIT_OBJECT_0 ;
+	success = aLock && EnterNonRecursiveMutex((PNRMUTEX) aLock, (waitflag ? INFINITE : 0)) == WAIT_OBJECT_0 ;
 
 	dprintf(("%ld: PyThread_acquire_lock(%p, %d) -> %d\n", PyThread_get_thread_ident(),aLock, waitflag, success));