diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8e4ce790..e6978687 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -69,6 +69,7 @@ endif()
 # The part of folly that isn't pure .h and we use:
 set (FOLLY_CPP_SRC
 "${FOLLY_SOURCE_DIR}/folly/Conv.cpp"
+"${FOLLY_SOURCE_DIR}/folly/lang/CString.cpp"
 "${FOLLY_SOURCE_DIR}/folly/Demangle.cpp"
 "${FOLLY_SOURCE_DIR}/folly/hash/Checksum.cpp"
 "${FOLLY_SOURCE_DIR}/folly/hash/detail/ChecksumDetail.cpp"