diff --git a/clang/unittests/AST/CMakeLists.txt b/clang/unittests/AST/CMakeLists.txt
index e33c74d7ce7200..ab718d192024e2 100644
--- a/clang/unittests/AST/CMakeLists.txt
+++ b/clang/unittests/AST/CMakeLists.txt
@@ -39,6 +39,7 @@ clang_target_link_libraries(ASTTests
   clangASTMatchers
   clangBasic
   clangFrontend
+  clangLex
   clangSerialization
   clangTesting
   clangTooling