diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index 2b9fa42cf457..e81ec7e54b62 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -1122,6 +1122,12 @@ void CXXNameMangler::mangleLocalName(const NamedDecl *ND) {
   //              := Z <function encoding> E s [<discriminator>]
   // <discriminator> := _ <non-negative number>
   const DeclContext *DC = ND->getDeclContext();
+  if (isa<ObjCMethodDecl>(DC) && isa<FunctionDecl>(ND)) {
+    // Don't add objc method name mangling to locally declared function
+    mangleUnqualifiedName(ND);
+    return;
+  }
+
   Out << 'Z';
 
   if (const ObjCMethodDecl *MD = dyn_cast<ObjCMethodDecl>(DC)) {
diff --git a/clang/test/CodeGenObjCXX/mangle.mm b/clang/test/CodeGenObjCXX/mangle.mm
index 7a75a5b40e4c..2521c6076a8c 100644
--- a/clang/test/CodeGenObjCXX/mangle.mm
+++ b/clang/test/CodeGenObjCXX/mangle.mm
@@ -42,3 +42,15 @@
 }
 @end
 
+// rdar://9566314
+@interface NX
+- (void)Meth;
+@end
+
+@implementation NX
+- (void)Meth {
+  void uiIsVisible();
+// CHECK: call void @_Z11uiIsVisiblev
+  uiIsVisible();
+}
+@end