diff --git a/atom/browser/atom_browser_client.cc b/atom/browser/atom_browser_client.cc
index 42892025b0..8b7915bae9 100644
--- a/atom/browser/atom_browser_client.cc
+++ b/atom/browser/atom_browser_client.cc
@@ -131,34 +131,28 @@ bool AtomBrowserClient::ShouldCreateNewSiteInstance(
 
 void AtomBrowserClient::AddProcessPreferences(
     int process_id, AtomBrowserClient::ProcessPreferences prefs) {
-  base::AutoLock auto_lock(process_preferences_lock_);
   process_preferences_[process_id] = prefs;
 }
 
 void AtomBrowserClient::RemoveProcessPreferences(int process_id) {
-  base::AutoLock auto_lock(process_preferences_lock_);
   process_preferences_.erase(process_id);
 }
 
 bool AtomBrowserClient::IsProcessObserved(int process_id) {
-  base::AutoLock auto_lock(process_preferences_lock_);
   return process_preferences_.find(process_id) != process_preferences_.end();
 }
 
 bool AtomBrowserClient::IsRendererSandboxed(int process_id) {
-  base::AutoLock auto_lock(process_preferences_lock_);
   auto it = process_preferences_.find(process_id);
   return it != process_preferences_.end() && it->second.sandbox;
 }
 
 bool AtomBrowserClient::RendererUsesNativeWindowOpen(int process_id) {
-  base::AutoLock auto_lock(process_preferences_lock_);
   auto it = process_preferences_.find(process_id);
   return it != process_preferences_.end() && it->second.native_window_open;
 }
 
 bool AtomBrowserClient::RendererDisablesPopups(int process_id) {
-  base::AutoLock auto_lock(process_preferences_lock_);
   auto it = process_preferences_.find(process_id);
   return it != process_preferences_.end() && it->second.disable_popups;
 }
diff --git a/atom/browser/atom_browser_client.h b/atom/browser/atom_browser_client.h
index 14633370ff..95afc70b58 100644
--- a/atom/browser/atom_browser_client.h
+++ b/atom/browser/atom_browser_client.h
@@ -140,8 +140,6 @@ class AtomBrowserClient : public brightray::BrowserClient,
   // list of site per affinity. weak_ptr to prevent instance locking
   std::map<std::string, content::SiteInstance*> site_per_affinities;
 
-  base::Lock process_preferences_lock_;
-
   std::unique_ptr<AtomResourceDispatcherHostDelegate>
       resource_dispatcher_host_delegate_;