diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -5569,7 +5569,6 @@
     if (!Arg.startswith(OptName))
       continue;
     Opt = Arg;
-    break;
   }
   if (Opt.empty())
     Opt = ToolChain::getTargetAndModeFromProgramName(ProgName).DriverMode;
diff --git a/clang/unittests/Driver/ToolChainTest.cpp b/clang/unittests/Driver/ToolChainTest.cpp
--- a/clang/unittests/Driver/ToolChainTest.cpp
+++ b/clang/unittests/Driver/ToolChainTest.cpp
@@ -16,6 +16,7 @@
 #include "clang/Basic/LLVM.h"
 #include "clang/Driver/Compilation.h"
 #include "clang/Driver/Driver.h"
+#include "llvm/ADT/ArrayRef.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/TargetSelect.h"
 #include "llvm/Support/VirtualFileSystem.h"
@@ -357,4 +358,10 @@
   EXPECT_TRUE(CallbackHasCalled);
 }
 
+TEST(GetDriverMode, PrefersLastDriverMode) {
+  static constexpr const char *Args[] = {"clang-cl", "--driver-mode=foo",
+                                         "--driver-mode=bar", "foo.cpp"};
+  EXPECT_EQ(getDriverMode(Args[0], llvm::makeArrayRef(Args).slice(1)), "bar");
+}
+
 } // end anonymous namespace.