diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index c7915fd..38a4b95 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -809,6 +809,8 @@
     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_NsMacros;
   if (Args.hasArg(OPT_objcmt_migrate_protocol_conformance))
     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_ProtocolConformance;
+  if (Args.hasArg(OPT_objcmt_atomic_property))
+    Opts.ObjCMTAction |= FrontendOptions::ObjCMT_AtomicProperty;
   if (Args.hasArg(OPT_objcmt_migrate_all))
     Opts.ObjCMTAction |= FrontendOptions::ObjCMT_MigrateDecls;