diff --git a/llvm/utils/gn/secondary/clang-tools-extra/clang-tidy/readability/BUILD.gn b/llvm/utils/gn/secondary/clang-tools-extra/clang-tidy/readability/BUILD.gn
index ad4de05f136f4..37e75a9720e63 100644
--- a/llvm/utils/gn/secondary/clang-tools-extra/clang-tidy/readability/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang-tools-extra/clang-tidy/readability/BUILD.gn
@@ -13,6 +13,7 @@ static_library("readability") {
   ]
   sources = [
     "AvoidConstParamsInDecls.cpp",
+    "AvoidNestedConditionalOperatorCheck.cpp",
     "AvoidReturnWithVoidValueCheck.cpp",
     "AvoidUnconditionalPreprocessorIfCheck.cpp",
     "BracesAroundStatementsCheck.cpp",