diff --git a/src/plugins/platforms/mirclient/qmirclientplugin.cpp b/src/plugins/platforms/mirclient/qmirclientplugin.cpp
index 201b68c3043..6899d70f2e7 100644
--- a/src/plugins/platforms/mirclient/qmirclientplugin.cpp
+++ b/src/plugins/platforms/mirclient/qmirclientplugin.cpp
@@ -41,13 +41,6 @@
 #include "qmirclientplugin.h"
 #include "qmirclientintegration.h"
 
-QStringList QMirClientIntegrationPlugin::keys() const
-{
-    QStringList list;
-    list << QStringLiteral("mirclient");
-    return list;
-}
-
 QPlatformIntegration* QMirClientIntegrationPlugin::create(const QString &system,
                                                                const QStringList &)
 {
diff --git a/src/plugins/platforms/mirclient/qmirclientplugin.h b/src/plugins/platforms/mirclient/qmirclientplugin.h
index 8b5da6e4f65..c91f2d19248 100644
--- a/src/plugins/platforms/mirclient/qmirclientplugin.h
+++ b/src/plugins/platforms/mirclient/qmirclientplugin.h
@@ -49,7 +49,6 @@ class QMirClientIntegrationPlugin : public QPlatformIntegrationPlugin
     Q_PLUGIN_METADATA(IID QPlatformIntegrationFactoryInterface_iid FILE "mirclient.json")
 
 public:
-    QStringList keys() const;
     QPlatformIntegration* create(const QString&, const QStringList&);
 };
 
diff --git a/src/plugins/platforms/winrt/main.cpp b/src/plugins/platforms/winrt/main.cpp
index 5d0d9e94ebc..222287b3ef7 100644
--- a/src/plugins/platforms/winrt/main.cpp
+++ b/src/plugins/platforms/winrt/main.cpp
@@ -49,15 +49,9 @@ class QWinRTIntegrationPlugin : public QPlatformIntegrationPlugin
     Q_PLUGIN_METADATA(IID QPlatformIntegrationFactoryInterface_iid FILE "winrt.json")
 
 public:
-    QStringList keys() const;
     QPlatformIntegration *create(const QString&, const QStringList&) override;
 };
 
-QStringList QWinRTIntegrationPlugin::keys() const
-{
-    return QStringList(QStringLiteral("WinRT"));
-}
-
 QPlatformIntegration *QWinRTIntegrationPlugin::create(const QString& system, const QStringList& paramList)
 {
     Q_UNUSED(paramList);