diff --git a/utils/gn/secondary/clang/lib/AST/BUILD.gn b/utils/gn/secondary/clang/lib/AST/BUILD.gn
index 36f10eb3b34..c904a6393d8 100644
--- a/utils/gn/secondary/clang/lib/AST/BUILD.gn
+++ b/utils/gn/secondary/clang/lib/AST/BUILD.gn
@@ -37,6 +37,7 @@ static_library("AST") {
   ]
   sources = [
     "APValue.cpp",
+    "ASTConcept.cpp",
     "ASTConsumer.cpp",
     "ASTContext.cpp",
     "ASTDiagnostic.cpp",