diff --git a/llvm/utils/gn/secondary/llvm/lib/Demangle/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/Demangle/BUILD.gn
index 81ddb6c76c41..bf10f6ca51a5 100644
--- a/llvm/utils/gn/secondary/llvm/lib/Demangle/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/Demangle/BUILD.gn
@@ -6,5 +6,6 @@ static_library("Demangle") {
     "ItaniumDemangle.cpp",
     "MicrosoftDemangle.cpp",
     "MicrosoftDemangleNodes.cpp",
+    "RustDemangle.cpp",
   ]
 }
diff --git a/llvm/utils/gn/secondary/llvm/unittests/Demangle/BUILD.gn b/llvm/utils/gn/secondary/llvm/unittests/Demangle/BUILD.gn
index 7576366065d5..1c73981e9641 100644
--- a/llvm/utils/gn/secondary/llvm/unittests/Demangle/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/unittests/Demangle/BUILD.gn
@@ -6,6 +6,7 @@ unittest("DemangleTests") {
     "DemangleTest.cpp",
     "ItaniumDemangleTest.cpp",
     "PartialDemangleTest.cpp",
+    "RustDemangleTest.cpp",
     "StringViewTest.cpp",
   ]
 }