diff --git a/lib/cpp/Makefile.am b/lib/cpp/Makefile.am
index 0ecbeee..82f2e3a 100755
--- a/lib/cpp/Makefile.am
+++ b/lib/cpp/Makefile.am
@@ -66,6 +66,7 @@
                        src/thrift/TOutput.cpp \
                        src/thrift/VirtualProfiling.cpp \
                        src/thrift/async/TAsyncChannel.cpp \
+                       src/thrift/async/TConcurrentClientSyncInfo.cpp \
                        src/thrift/concurrency/ThreadManager.cpp \
                        src/thrift/concurrency/TimerManager.cpp \
                        src/thrift/concurrency/Util.cpp \