diff --git a/Source/Common/CrossProcessMutex.h b/Source/Common/CrossProcessMutex.h
index 2f3ce70..f0fcd42 100644
--- a/Source/Common/CrossProcessMutex.h
+++ b/Source/Common/CrossProcessMutex.h
@@ -127,9 +127,13 @@ class CrossProcessMutex

 public:
     CrossProcessMutex(const std::string& name)
-        : m_fd(-1),
-          m_fileName("/var/lock/" + name)
+        : m_fd(-1)
     {
+        const char * const envLockDir = getenv("CNTK_LOCK_DIR");
+        if (envLockDir != NULL)
+            m_fileName = envLockDir + ('/' + name);
+        else
+            m_fileName = "/var/lock/" + name;
     }

     // Acquires the mutex. If 'wait' is true and mutex is acquired by someone else then