diff --git a/llvm/utils/gn/secondary/llvm/lib/DebugInfo/GSYM/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/DebugInfo/GSYM/BUILD.gn
index f2717b85c979..ceaf5e509d56 100644
--- a/llvm/utils/gn/secondary/llvm/lib/DebugInfo/GSYM/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/DebugInfo/GSYM/BUILD.gn
@@ -6,6 +6,7 @@ static_library("GSYM") {
   sources = [
     "FileWriter.cpp",
     "FunctionInfo.cpp",
+    "Header.cpp",
     "InlineInfo.cpp",
     "LineTable.cpp",
     "Range.cpp",