diff --git a/components/nif/nif_file.cpp b/components/nif/nif_file.cpp
index e6d3182eda..58d1bc9b85 100644
--- a/components/nif/nif_file.cpp
+++ b/components/nif/nif_file.cpp
@@ -37,7 +37,7 @@
 
 //TODO: when threading is needed, enable these
 //#include <boost/mutex.hpp>
-//#include <boost/thread/locks.hpp>
+#include <boost/thread/locks.hpp>
 
 namespace Nif
 {