diff --git a/lld/test/COFF/driver-windows.test b/lld/test/COFF/driver-windows.test
new file mode 100644
index 000000000000..1b93a53bddb3
--- /dev/null
+++ b/lld/test/COFF/driver-windows.test
@@ -0,0 +1,3 @@
+# REQUIRES: system-windows
+# RUN: not LLD-LINK 2>&1 | FileCheck %s
+CHECK: no input files
diff --git a/lld/tools/lld/lld.cpp b/lld/tools/lld/lld.cpp
index b17e9af24d0a..09f8079010d4 100644
--- a/lld/tools/lld/lld.cpp
+++ b/lld/tools/lld/lld.cpp
@@ -43,9 +43,9 @@ LLVM_ATTRIBUTE_NORETURN static void die(const Twine &S) {
 
 static Flavor getFlavor(StringRef S) {
   return StringSwitch<Flavor>(S)
-      .Cases("ld", "ld.lld", "gnu", Gnu)
-      .Case("link", WinLink)
-      .Case("darwin", Darwin)
+      .CasesLower("ld", "ld.lld", "gnu", Gnu)
+      .CaseLower("link", WinLink)
+      .CaseLower("darwin", Darwin)
       .Default(Invalid);
 }