diff --git a/atom/browser/api/atom_api_app.cc b/atom/browser/api/atom_api_app.cc
index a9011c6e2e75..42feaf8dc4ec 100644
--- a/atom/browser/api/atom_api_app.cc
+++ b/atom/browser/api/atom_api_app.cc
@@ -288,10 +288,6 @@ v8::Local<v8::Value> App::DefaultSession(v8::Isolate* isolate) {
 
 bool App::MakeSingleInstance(
     const ProcessSingleton::NotificationCallback& callback) {
-#if defined(OS_MACOSX)
-  LOG(ERROR) << "MakeSingleInstance is not implemnted on OS X";
-  return false;
-#endif
   if (process_singleton_.get())
     return false;
 
diff --git a/docs/api/app.md b/docs/api/app.md
index bd017456a78c..95aa80b6dc83 100644
--- a/docs/api/app.md
+++ b/docs/api/app.md
@@ -290,7 +290,7 @@ URLs that fall under "Local Intranet" sites (i.e. are in the same domain as you)
 However, this detection often fails when corporate networks are badly configured,
 so this lets you co-opt this behavior and enable it for all URLs.
 
-### `app.makeSingleInstance(callback)` _Windows_ _Linux_
+### `app.makeSingleInstance(callback)`
 
 * `callback` Function