diff --git a/src/zig_clang_cc1_main.cpp b/src/zig_clang_cc1_main.cpp
index 0b245be591..b551e9f4cf 100644
--- a/src/zig_clang_cc1_main.cpp
+++ b/src/zig_clang_cc1_main.cpp
@@ -274,4 +274,3 @@ int cc1_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
 
   return !Success;
 }
-
diff --git a/src/zig_clang_cc1as_main.cpp b/src/zig_clang_cc1as_main.cpp
index f810c62a88..53c8a9d642 100644
--- a/src/zig_clang_cc1as_main.cpp
+++ b/src/zig_clang_cc1as_main.cpp
@@ -614,4 +614,3 @@ int cc1as_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {
 
   return !!Failed;
 }
-
diff --git a/src/zig_clang_driver.cpp b/src/zig_clang_driver.cpp
index 8b3afdb1d4..a3150022b3 100644
--- a/src/zig_clang_driver.cpp
+++ b/src/zig_clang_driver.cpp
@@ -239,8 +239,6 @@ static void getCLEnvVarOptions(std::string &EnvValue, llvm::StringSaver &Saver,
       *NumberSignPtr = '=';
 }
 
-static int ExecuteCC1Tool(ArrayRef<const char *> argv);
-
 static void SetBackdoorDriverOutputsFromEnvVars(Driver &TheDriver) {
   // Handle CC_PRINT_OPTIONS and CC_PRINT_OPTIONS_FILE.
   TheDriver.CCPrintOptions = !!::getenv("CC_PRINT_OPTIONS");
@@ -311,19 +309,24 @@ static void SetInstallDir(SmallVectorImpl<const char *> &argv,
     TheDriver.setInstalledDir(InstalledPathParent);
 }
 
-static int ExecuteCC1Tool(ArrayRef<const char *> argv) {
+static int ExecuteCC1Tool(SmallVectorImpl<const char *> &ArgV) {
   // If we call the cc1 tool from the clangDriver library (through
   // Driver::CC1Main), we need to clean up the options usage count. The options
   // are currently global, and they might have been used previously by the
   // driver.
   llvm::cl::ResetAllOptionOccurrences();
-  StringRef Tool = argv[1];
-  void *GetExecutablePathVP = (void *)(intptr_t) GetExecutablePath;
-  if (Tool == "-cc1")
-    return cc1_main(argv.slice(2), argv[0], GetExecutablePathVP);
-  if (Tool == "-cc1as")
-    return cc1as_main(argv.slice(2), argv[0], GetExecutablePathVP);
 
+  llvm::BumpPtrAllocator A;
+  llvm::StringSaver Saver(A);
+  llvm::cl::ExpandResponseFiles(Saver, &llvm::cl::TokenizeGNUCommandLine, ArgV,
+                                /*MarkEOLs=*/false);
+  StringRef Tool = ArgV[1];
+  void *GetExecutablePathVP = (void *)(intptr_t)GetExecutablePath;
+  if (Tool == "-cc1")
+    return cc1_main(makeArrayRef(ArgV).slice(2), ArgV[0], GetExecutablePathVP);
+  if (Tool == "-cc1as")
+    return cc1as_main(makeArrayRef(ArgV).slice(2), ArgV[0],
+                      GetExecutablePathVP);
   // Reject unknown tools.
   llvm::errs() << "error: unknown integrated tool '" << Tool << "'. "
                << "Valid tools include '-cc1' and '-cc1as'.\n";
@@ -541,4 +544,3 @@ int ZigClang_main(int argc_, const char **argv_) {
   // failing command.
   return Res;
 }
-