diff --git a/lib/cpp/Makefile.am b/lib/cpp/Makefile.am
index 5ba3f64..96e44e8 100644
--- a/lib/cpp/Makefile.am
+++ b/lib/cpp/Makefile.am
@@ -28,6 +28,7 @@
                        src/concurrency/PosixThreadFactory.cpp \
                        src/concurrency/ThreadManager.cpp \
                        src/concurrency/TimerManager.cpp \
+                       src/concurrency/Util.cpp \
                        src/protocol/TBinaryProtocol.cpp \
                        src/protocol/TDebugProtocol.cpp \
                        src/protocol/TDenseProtocol.cpp \