diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 79e087e..34ad608 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -777,6 +777,8 @@
     Res.push_back("-fdelayed-template-parsing");
   if (Opts.Deprecated)
     Res.push_back("-fdeprecated-macro");
+  if (Opts.ApplePragmaPack)
+    Res.push_back("-fapple-pragma-pack");
 }
 
 static void PreprocessorOptsToArgs(const PreprocessorOptions &Opts,
@@ -1763,6 +1765,7 @@
   Opts.FakeAddressSpaceMap = Args.hasArg(OPT_ffake_address_space_map);
   Opts.ParseUnknownAnytype = Args.hasArg(OPT_funknown_anytype);
   Opts.DebuggerSupport = Args.hasArg(OPT_fdebugger_support);
+  Opts.ApplePragmaPack = Args.hasArg(OPT_fapple_pragma_pack);
 
   // Record whether the __DEPRECATED define was requested.
   Opts.Deprecated = Args.hasFlag(OPT_fdeprecated_macro,