diff --git a/llvm/utils/gn/secondary/clang/lib/AST/BUILD.gn b/llvm/utils/gn/secondary/clang/lib/AST/BUILD.gn
index 4d645799dbf655..bb3d69d046bef1 100644
--- a/llvm/utils/gn/secondary/clang/lib/AST/BUILD.gn
+++ b/llvm/utils/gn/secondary/clang/lib/AST/BUILD.gn
@@ -81,6 +81,7 @@ static_library("AST") {
     "ExternalASTMerger.cpp",
     "ExternalASTSource.cpp",
     "FormatString.cpp",
+    "IgnoreExpr.cpp",
     "InheritViz.cpp",
     "Interp/ByteCodeEmitter.cpp",
     "Interp/ByteCodeExprGen.cpp",