diff --git a/src/kmessagewidget.cpp b/src/kmessagewidget.cpp
--- a/src/kmessagewidget.cpp
+++ b/src/kmessagewidget.cpp
@@ -21,6 +21,7 @@
 #include "kmessagewidget.h"
 
 #include <QAction>
+#include <QApplication>
 #include <QEvent>
 #include <QGridLayout>
 #include <QHBoxLayout>
@@ -98,6 +99,8 @@
     closeButton->setDefaultAction(closeAction);
 
     q->setMessageType(KMessageWidget::Information);
+
+    q->connect(qApp, &QApplication::paletteChanged, q, [this] {KMessageWidgetPrivate::setPalette();});
 }
 
 void KMessageWidgetPrivate::createLayout()
@@ -185,6 +188,7 @@
     QPalette palette = q->palette();
     palette.setColor(QPalette::Window, bgBaseColor);
     q->setPalette(palette);
+    q->style()->polish(q);
 }
 
 void KMessageWidgetPrivate::updateLayout()
@@ -282,8 +286,6 @@
 {
     if (event->type() == QEvent::Polish && !layout()) {
         d->createLayout();
-    } else if (event->type() == QEvent::PaletteChange) {
-        d->setPalette();
     } else if (event->type() == QEvent::Show && !d->ignoreShowEventDoingAnimatedShow) {
         setFixedHeight(d->bestContentHeight());
     }