diff --git a/llvm/utils/gn/secondary/llvm/lib/Target/SystemZ/MCTargetDesc/BUILD.gn b/llvm/utils/gn/secondary/llvm/lib/Target/SystemZ/MCTargetDesc/BUILD.gn
index 580dfe10f4060..b0ecd39d545e5 100644
--- a/llvm/utils/gn/secondary/llvm/lib/Target/SystemZ/MCTargetDesc/BUILD.gn
+++ b/llvm/utils/gn/secondary/llvm/lib/Target/SystemZ/MCTargetDesc/BUILD.gn
@@ -55,6 +55,7 @@ static_library("MCTargetDesc") {
     "SystemZMCAsmBackend.cpp",
     "SystemZMCAsmInfo.cpp",
     "SystemZMCCodeEmitter.cpp",
+    "SystemZMCExpr.cpp",
     "SystemZMCObjectWriter.cpp",
     "SystemZMCTargetDesc.cpp",
   ]