--- a/netwerk/socket/nsSOCKSIOLayer.cpp
+++ b/netwerk/socket/nsSOCKSIOLayer.cpp
@@ -14,19 +14,18 @@
 #include "nsIDNSRecord.h"
 #include "nsISOCKSSocketInfo.h"
 #include "nsISocketProvider.h"
 #include "nsSOCKSIOLayer.h"
 #include "nsNetCID.h"
 #include "nsIDNSListener.h"
 #include "nsICancelable.h"
 #include "nsThreadUtils.h"
-#include "nsIURL.h"
 #include "nsIFile.h"
-#include "nsNetUtil.h"
+#include "nsIFileProtocolHandler.h"
 #include "mozilla/Logging.h"
 #include "mozilla/net/DNS.h"
 #include "mozilla/Unused.h"
 
 using mozilla::LogLevel;
 using namespace mozilla::net;
 
 static PRDescIdentity nsSOCKSIOLayerIdentity;
@@ -128,19 +127,31 @@ private:
 
     nsresult SetDomainSocketPath(const nsACString& aDomainSocketPath,
                              NetAddr* aProxyAddr)
     {
 #ifdef XP_UNIX
         nsresult rv;
         MOZ_ASSERT(aProxyAddr);
 
+        nsCOMPtr<nsIProtocolHandler> protocolHandler(
+            do_GetService(NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "file", &rv));
+        if (NS_WARN_IF(NS_FAILED(rv))) {
+            return rv;
+        }
+
+        nsCOMPtr<nsIFileProtocolHandler> fileHandler(
+            do_QueryInterface(protocolHandler, &rv));
+        if (NS_WARN_IF(NS_FAILED(rv))) {
+            return rv;
+        }
+
         nsCOMPtr<nsIFile> socketFile;
-        rv = NS_GetFileFromURLSpec(aDomainSocketPath,
-                                   getter_AddRefs(socketFile));
+        rv = fileHandler->GetFileFromURLSpec(aDomainSocketPath,
+                                             getter_AddRefs(socketFile));
         if (NS_WARN_IF(NS_FAILED(rv))) {
             return rv;
         }
 
         nsAutoCString path;
         if (NS_WARN_IF(NS_FAILED(rv = socketFile->GetNativePath(path)))) {
             return rv;
         }