diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 2dd96e68bb92f..82dcc2a59e0f9 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -4544,7 +4544,10 @@ bool CompilerInvocation::CreateFromArgs(CompilerInvocation &Invocation,
         return CreateFromArgsImpl(Invocation, CommandLineArgs, Diags, Argv0);
       },
       [](CompilerInvocation &Invocation, SmallVectorImpl<const char *> &Args,
-         StringAllocator SA) { Invocation.generateCC1CommandLine(Args, SA); },
+         StringAllocator SA) {
+        Args.push_back("-cc1");
+        Invocation.generateCC1CommandLine(Args, SA);
+      },
       Invocation, DummyInvocation, CommandLineArgs, Diags, Argv0);
 }
 
diff --git a/clang/unittests/Frontend/CompilerInvocationTest.cpp b/clang/unittests/Frontend/CompilerInvocationTest.cpp
index fe6785257e926..d4c6981df17c2 100644
--- a/clang/unittests/Frontend/CompilerInvocationTest.cpp
+++ b/clang/unittests/Frontend/CompilerInvocationTest.cpp
@@ -23,6 +23,7 @@ using namespace clang;
 using ::testing::Contains;
 using ::testing::HasSubstr;
 using ::testing::StrEq;
+using ::testing::StartsWith;
 
 namespace {
 class CommandLineTest : public ::testing::Test {
@@ -145,6 +146,26 @@ TEST_F(CommandLineTest, BoolOptionDefaultTrueSingleFlagPresent) {
   ASSERT_THAT(GeneratedArgs, Contains(StrEq("-fno-temp-file")));
 }
 
+TEST_F(CommandLineTest, CC1FlagPresentWhenDoingRoundTrip) {
+  const char *Args[] = {"-cc1", "-round-trip-args"};
+
+  ASSERT_TRUE(CompilerInvocation::CreateFromArgs(Invocation, Args, *Diags));
+
+  ASSERT_THAT(std::string(Invocation.getCodeGenOpts().CmdArgs.begin(),
+                          Invocation.getCodeGenOpts().CmdArgs.end()),
+              StartsWith("-cc1"));
+}
+
+TEST_F(CommandLineTest, CC1FlagPresentWhenNotDoingRoundTrip) {
+  const char *Args[] = {"-cc1", "-no-round-trip-args"};
+
+  ASSERT_TRUE(CompilerInvocation::CreateFromArgs(Invocation, Args, *Diags));
+
+  ASSERT_THAT(std::string(Invocation.getCodeGenOpts().CmdArgs.begin(),
+                          Invocation.getCodeGenOpts().CmdArgs.end()),
+              StartsWith("-cc1"));
+}
+
 TEST_F(CommandLineTest, BoolOptionDefaultTrueSingleFlagUnknownPresent) {
   const char *Args[] = {"-ftemp-file"};