diff --git a/utils/gn/secondary/llvm/lib/Demangle/BUILD.gn b/utils/gn/secondary/llvm/lib/Demangle/BUILD.gn
index 8e97dfea30f..81ddb6c76c4 100644
--- a/utils/gn/secondary/llvm/lib/Demangle/BUILD.gn
+++ b/utils/gn/secondary/llvm/lib/Demangle/BUILD.gn
@@ -2,6 +2,7 @@ static_library("Demangle") {
   output_name = "LLVMDemangle"
 
   sources = [
+    "Demangle.cpp",
     "ItaniumDemangle.cpp",
     "MicrosoftDemangle.cpp",
     "MicrosoftDemangleNodes.cpp",
diff --git a/utils/gn/secondary/llvm/unittests/Demangle/BUILD.gn b/utils/gn/secondary/llvm/unittests/Demangle/BUILD.gn
index c7eedfbe715..7981d94067e 100644
--- a/utils/gn/secondary/llvm/unittests/Demangle/BUILD.gn
+++ b/utils/gn/secondary/llvm/unittests/Demangle/BUILD.gn
@@ -5,6 +5,7 @@ unittest("DemangleTests") {
     "//llvm/lib/Demangle",
   ]
   sources = [
+    "DemangleTest.cpp",
     "ItaniumDemangleTest.cpp",
     "PartialDemangleTest.cpp",
   ]