diff --git a/src/platformtheme/CMakeLists.txt b/src/platformtheme/CMakeLists.txt
--- a/src/platformtheme/CMakeLists.txt
+++ b/src/platformtheme/CMakeLists.txt
@@ -24,7 +24,6 @@
 
 set(platformtheme_SRCS
     kdeplatformtheme.cpp
-    qdbusmenubar.cpp # fork of Qt's qdbusmenubar with some added setters for our convenience
     kfontsettingsdata.cpp
     khintssettings.cpp
     kdeplatformfiledialoghelper.cpp
@@ -37,6 +36,12 @@
     main.cpp
 )
 
+if(Qt5Core_VERSION VERSION_EQUAL "5.7.0" OR Qt5Core_VERSION VERSION_GREATER "5.7.0")
+set(platformtheme_SRCS
+    qdbusmenubar.cpp # fork of Qt's qdbusmenubar with some added setters for our convenience
+    ${platformtheme_SRCS}
+)
+endif()
 
 add_library(KDEPlasmaPlatformTheme MODULE ${platformtheme_SRCS})
 
diff --git a/src/platformtheme/kdeplatformtheme.h b/src/platformtheme/kdeplatformtheme.h
--- a/src/platformtheme/kdeplatformtheme.h
+++ b/src/platformtheme/kdeplatformtheme.h
@@ -55,7 +55,9 @@
 
     QPlatformSystemTrayIcon *createPlatformSystemTrayIcon() const Q_DECL_OVERRIDE;
 
+#ifdef QT_VERSION > QT_VERSION_CHECK(5.7.0)
     QPlatformMenuBar *createPlatformMenuBar() const Q_DECL_OVERRIDE;
+#endif
 
 private:
     void loadSettings();
diff --git a/src/platformtheme/kdeplatformtheme.cpp b/src/platformtheme/kdeplatformtheme.cpp
--- a/src/platformtheme/kdeplatformtheme.cpp
+++ b/src/platformtheme/kdeplatformtheme.cpp
@@ -48,7 +48,9 @@
 #include <KLocalizedString>
 #include <KWindowSystem>
 
+#ifdef QT_VERSION > QT_VERSION_CHECK(5.7.0)
 #include "qdbusmenubar_p.h"
+#endif
 
 static const QByteArray s_x11AppMenuServiceNamePropertyName = QByteArrayLiteral("_KDE_NET_WM_APPMENU_SERVICE_NAME");
 static const QByteArray s_x11AppMenuObjectPathPropertyName = QByteArrayLiteral("_KDE_NET_WM_APPMENU_OBJECT_PATH");
@@ -321,6 +323,7 @@
     return new KDEPlatformSystemTrayIcon;
 }
 
+#ifdef QT_VERSION > QT_VERSION_CHECK(5.7.0)
 QPlatformMenuBar *KdePlatformTheme::createPlatformMenuBar() const
 {
     if (isDBusGlobalMenuAvailable()) {
@@ -360,5 +363,6 @@
 
     return nullptr;
 }
+#endif
 
 #include "kdeplatformtheme.moc"