diff --git a/lib/cpp/src/concurrency/PosixThreadFactory.cpp b/lib/cpp/src/concurrency/PosixThreadFactory.cpp
index 3f35681..27c5dfa 100644
--- a/lib/cpp/src/concurrency/PosixThreadFactory.cpp
+++ b/lib/cpp/src/concurrency/PosixThreadFactory.cpp
@@ -16,7 +16,8 @@
 
 namespace facebook { namespace thrift { namespace concurrency {
 
-using namespace boost;
+using boost::shared_ptr;
+using boost::weak_ptr;
 
 /**
  * The POSIX thread class.
diff --git a/lib/cpp/src/concurrency/ThreadManager.cpp b/lib/cpp/src/concurrency/ThreadManager.cpp
index d8b1e8c..eec94be 100644
--- a/lib/cpp/src/concurrency/ThreadManager.cpp
+++ b/lib/cpp/src/concurrency/ThreadManager.cpp
@@ -20,7 +20,8 @@
 
 namespace facebook { namespace thrift { namespace concurrency {
 
-using namespace boost;
+using boost::shared_ptr;
+using boost::dynamic_pointer_cast;
 
 /**
  * ThreadManager class