diff --git a/llvm/utils/gn/secondary/lldb/source/Plugins/Language/CPlusPlus/BUILD.gn b/llvm/utils/gn/secondary/lldb/source/Plugins/Language/CPlusPlus/BUILD.gn
index 9d57f2f0877e3..91e5be0c8e27c 100644
--- a/llvm/utils/gn/secondary/lldb/source/Plugins/Language/CPlusPlus/BUILD.gn
+++ b/llvm/utils/gn/secondary/lldb/source/Plugins/Language/CPlusPlus/BUILD.gn
@@ -32,6 +32,7 @@ static_library("CPlusPlus") {
     "LibCxxInitializerList.cpp",
     "LibCxxList.cpp",
     "LibCxxMap.cpp",
+    "LibCxxProxyArray.cpp",
     "LibCxxQueue.cpp",
     "LibCxxRangesRefView.cpp",
     "LibCxxSliceArray.cpp",