diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -69,6 +69,7 @@
 set (HAVE_GLOBALACCEL ${KF5GlobalAccel_FOUND})
 add_definitions(-DQT_DISABLE_DEPRECATED_BEFORE=0x050d00)
 add_definitions(-DQT_DEPRECATED_WARNINGS_SINCE=0x060000)
+add_definitions(-DKF_DISABLE_DEPRECATED_BEFORE_AND_AT=0x053f00)
 # Subdirectories
 add_definitions(-DTRANSLATION_DOMAIN=\"kxmlgui5\")
 if (IS_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/po")
diff --git a/src/kaboutapplicationdialog.cpp b/src/kaboutapplicationdialog.cpp
--- a/src/kaboutapplicationdialog.cpp
+++ b/src/kaboutapplicationdialog.cpp
@@ -84,10 +84,7 @@
     //Set up the title widget...
     KTitleWidget *titleWidget = new KTitleWidget(q);
 
-    QIcon windowIcon = qApp->windowIcon();
-    if (windowIcon.isNull() && !aboutData.programIconName().isEmpty()) {
-        windowIcon = QIcon::fromTheme(aboutData.programIconName());
-    }
+    const QIcon windowIcon = qApp->windowIcon();
     titleWidget->setPixmap(windowIcon.pixmap(48, 48), KTitleWidget::ImageLeft);
     if (aboutData.programLogo().canConvert<QPixmap>()) {
         titleWidget->setPixmap(aboutData.programLogo().value<QPixmap>(), KTitleWidget::ImageLeft);