diff --git a/BaseTools/Source/C/Makefiles/NmakeSubdirs.py b/BaseTools/Source/C/Makefiles/NmakeSubdirs.py
index 1f4a45004f..7860c040af 100644
--- a/BaseTools/Source/C/Makefiles/NmakeSubdirs.py
+++ b/BaseTools/Source/C/Makefiles/NmakeSubdirs.py
@@ -132,7 +132,7 @@ class ThreadControl(object):
                 break
 
         self.runningLock.acquire(True)
-        self.running.remove(threading.currentThread())
+        self.running.remove(threading.current_thread())
         self.runningLock.release()
 
 def Run():