diff --git a/test/cpp/CMakeLists.txt b/test/cpp/CMakeLists.txt
index d993c6d..79cc008 100755
--- a/test/cpp/CMakeLists.txt
+++ b/test/cpp/CMakeLists.txt
@@ -31,6 +31,7 @@
     gen-cpp/ThriftTest.cpp
     gen-cpp/ThriftTest_types.cpp
     gen-cpp/ThriftTest_constants.cpp
+    src/ThriftTest_extras.cpp
 )
 add_library(crosstestgencpp STATIC ${crosstestgencpp_SOURCES})
 target_link_libraries(crosstestgencpp thrift)