diff --git a/network/networkproxyfactory.cpp b/network/networkproxyfactory.cpp
index d77d07e74..ebba36819 100644
--- a/network/networkproxyfactory.cpp
+++ b/network/networkproxyfactory.cpp
@@ -34,7 +34,7 @@ NetworkProxyFactory::NetworkProxyFactory()
     , type(QNetworkProxy::HttpProxy)
     , port(8080)
 {
-    #ifdef Q_OS_LINUX
+    #if defined Q_OS_LINUX && QT_VERSION < 0x050000
     // Linux uses environment variables to pass proxy configuration information,
     // which systemProxyForQuery doesn't support for some reason.
 
@@ -89,7 +89,7 @@ QList<QNetworkProxy> NetworkProxyFactory::queryProxy(const QNetworkProxyQuery& q
 
     switch (mode) {
     case Mode_System:
-        #ifdef Q_OS_LINUX
+        #if defined Q_OS_LINUX && QT_VERSION < 0x050000
         Q_UNUSED(query);
 
         if (envUrl.isEmpty()) {
diff --git a/network/networkproxyfactory.h b/network/networkproxyfactory.h
index 9a3ce420a..58f6e54d5 100644
--- a/network/networkproxyfactory.h
+++ b/network/networkproxyfactory.h
@@ -56,7 +56,7 @@ private:
     int port;
     QString username;
     QString password;
-    #ifdef Q_OS_LINUX
+    #if defined Q_OS_LINUX && QT_VERSION < 0x050000
     QUrl envUrl;
     #endif
 };