diff --git a/lib/Support/CMakeLists.txt b/lib/Support/CMakeLists.txt
index 3d718e6a11c..229a1a3f875 100644
--- a/lib/Support/CMakeLists.txt
+++ b/lib/Support/CMakeLists.txt
@@ -130,6 +130,7 @@ add_llvm_library(LLVMSupport
   ADDITIONAL_HEADER_DIRS
   Unix
   Windows
+  ${LLVM_MAIN_INCLUDE_DIR}/llvm/ADT
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Support
 
   LINK_LIBS ${system_libs}