diff --git a/lib/DriverTool/modulewrap_main.cpp b/lib/DriverTool/modulewrap_main.cpp
index 3bce40120d045..f918613db0ea0 100644
--- a/lib/DriverTool/modulewrap_main.cpp
+++ b/lib/DriverTool/modulewrap_main.cpp
@@ -48,6 +48,7 @@ class ModuleWrapInvocation {
   llvm::Triple TargetTriple;
   std::vector<std::string> InputFilenames;
   bool UseSharedResourceFolder = true;
+  bool EnableObjCInterop = true;
 
 public:
   bool hasSingleInput() const { return InputFilenames.size() == 1; }
@@ -65,6 +66,7 @@ class ModuleWrapInvocation {
   llvm::Triple &getTargetTriple() { return TargetTriple; }
 
   bool useSharedResourceFolder() { return UseSharedResourceFolder; }
+  bool enableObjCInterop() { return EnableObjCInterop; }
 
   int parseArgs(llvm::ArrayRef<const char *> Args, DiagnosticEngine &Diags) {
     using namespace options;
@@ -124,6 +126,9 @@ class ModuleWrapInvocation {
       UseSharedResourceFolder = false;
     }
 
+    EnableObjCInterop = ParsedArgs.hasFlag(OPT_enable_objc_interop,
+        OPT_disable_objc_interop, TargetTriple.isOSDarwin());
+
     return 0;
   }
 };
@@ -184,6 +189,7 @@ int modulewrap_main(ArrayRef<const char *> Args, const char *Argv0,
   symbolgraphgen::SymbolGraphOptions SymbolGraphOpts;
   CASOptions CASOpts;
   LangOpts.Target = Invocation.getTargetTriple();
+  LangOpts.EnableObjCInterop = Invocation.enableObjCInterop();
   ASTContext &ASTCtx = *ASTContext::get(
       LangOpts, TypeCheckOpts, SILOpts, SearchPathOpts, ClangImporterOpts,
       SymbolGraphOpts, CASOpts, SrcMgr, Instance.getDiags(),