diff --git a/browser/net/atom_url_request_context_getter.cc b/browser/net/atom_url_request_context_getter.cc
index 0c5a5c6ec0..bdc72028e6 100644
--- a/browser/net/atom_url_request_context_getter.cc
+++ b/browser/net/atom_url_request_context_getter.cc
@@ -66,6 +66,7 @@ AtomURLRequestContextGetter::~AtomURLRequestContextGetter() {
 net::URLRequestContext* AtomURLRequestContextGetter::GetURLRequestContext() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
+  base::AutoLock auto_lock(lock_);
   if (!url_request_context_.get()) {
     url_request_context_.reset(new net::URLRequestContext());
     network_delegate_ = network_delegate_factory_.Run().Pass();
diff --git a/browser/net/atom_url_request_context_getter.h b/browser/net/atom_url_request_context_getter.h
index f66be82e39..e2c5f365c2 100644
--- a/browser/net/atom_url_request_context_getter.h
+++ b/browser/net/atom_url_request_context_getter.h
@@ -8,6 +8,7 @@
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/synchronization/lock.h"
 #include "content/public/browser/content_browser_client.h"
 #include "net/url_request/url_request_context_getter.h"
 
@@ -59,6 +60,8 @@ class AtomURLRequestContextGetter : public net::URLRequestContextGetter {
   base::Callback<scoped_ptr<brightray::NetworkDelegate>(void)>
       network_delegate_factory_;
 
+  base::Lock lock_;
+
   scoped_ptr<net::ProxyConfigService> proxy_config_service_;
   scoped_ptr<brightray::NetworkDelegate> network_delegate_;
   scoped_ptr<net::URLRequestContextStorage> storage_;