diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,7 +4,7 @@
 
 cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)
 set(QT_MIN_VERSION "5.12.0")
-set(KF5_MIN_VERSION "5.62.0")
+set(KF5_MIN_VERSION "5.64.0")
 
 find_package(ECM ${KF5_MIN_VERSION} REQUIRED NO_MODULE)
 
diff --git a/src/windowsystem/windowsystem.h b/src/windowsystem/windowsystem.h
--- a/src/windowsystem/windowsystem.h
+++ b/src/windowsystem/windowsystem.h
@@ -52,7 +52,7 @@
     void setOnAllDesktops(WId win, bool b) override;
     void setOnDesktop(WId win, int desktop) override;
     void setOnActivities(WId win, const QStringList &activities) override;
-#ifndef KWINDOWSYSTEM_NO_DEPRECATED
+#if KWINDOWSYSTEM_BUILD_DEPRECATED_SINCE(5, 0)
     WId transientFor(WId window) override;
     WId groupLeader(WId window) override;
 #endif
diff --git a/src/windowsystem/windowsystem.cpp b/src/windowsystem/windowsystem.cpp
--- a/src/windowsystem/windowsystem.cpp
+++ b/src/windowsystem/windowsystem.cpp
@@ -148,12 +148,14 @@
     return QPoint();
 }
 
+#if KWINDOWSYSTEM_BUILD_DEPRECATED_SINCE(5, 0)
 WId WindowSystem::groupLeader(WId window)
 {
     Q_UNUSED(window)
     qCDebug(KWAYLAND_KWS) << "This plugin does not support group leader";
     return 0;
 }
+#endif
 
 bool WindowSystem::icccmCompliantMappingState()
 {
@@ -519,12 +521,14 @@
     return ret;
 }
 
+#if KWINDOWSYSTEM_BUILD_DEPRECATED_SINCE(5, 0)
 WId WindowSystem::transientFor(WId window)
 {
     Q_UNUSED(window)
     qCDebug(KWAYLAND_KWS) << "This plugin does not support transient for windows";
     return 0;
 }
+#endif
 
 int WindowSystem::viewportToDesktop(const QPoint &pos)
 {