diff --git a/llvm/lib/Support/CMakeLists.txt b/llvm/lib/Support/CMakeLists.txt
index 5f6dd4c15a5e..4a9f77541cdc 100644
--- a/llvm/lib/Support/CMakeLists.txt
+++ b/llvm/lib/Support/CMakeLists.txt
@@ -31,6 +31,7 @@ add_llvm_library(LLVMSupport
   TargetRegistry.cpp
   Timer.cpp
   Triple.cpp
+  Twine.cpp
   raw_ostream.cpp
   )