diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
index 6d5faf9..beaa092 100644
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -578,6 +578,8 @@
   Opts.AddMissingHeaderDeps = Args.hasArg(OPT_MG);
   Opts.PrintShowIncludes = Args.hasArg(OPT_show_includes);
   Opts.DOTOutputFile = Args.getLastArgValue(OPT_dependency_dot);
+  Opts.ModuleDependencyOutputDir =
+      Args.getLastArgValue(OPT_module_dependency_dir);
 }
 
 bool clang::ParseDiagnosticArgs(DiagnosticOptions &Opts, ArgList &Args,