diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index 98745ac..8bac00b 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -815,6 +815,8 @@
     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
   if (Args.hasArg(OPT_objcmt_atomic_property))
     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
+  if (Args.hasArg(OPT_objcmt_ns_nonatomic_iosonly))
+    Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsAtomicIOSOnlyProperty;
   if (Args.hasArg(OPT_objcmt_migrate_all))
     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;