diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -76,7 +76,6 @@
 find_package(KF5GlobalAccel ${KF5_MIN_VERSION} REQUIRED)
 find_package(KF5GuiAddons ${KF5_MIN_VERSION} REQUIRED)
 find_package(KF5I18n ${KF5_MIN_VERSION} CONFIG REQUIRED)
-find_package(KF5IconThemes ${KF5_MIN_VERSION} REQUIRED)
 find_package(KF5JobWidgets ${KF5_MIN_VERSION} REQUIRED)
 find_package(KF5KCMUtils ${KF5_MIN_VERSION} CONFIG REQUIRED)
 find_package(KF5KIO ${KF5_MIN_VERSION} CONFIG REQUIRED)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -144,7 +144,6 @@
     KF5::GlobalAccel
     KF5::GuiAddons
     KF5::Holidays
-    KF5::IconThemes
     KF5::KIOWidgets
     KF5::Notifications
     KF5::TextWidgets
diff --git a/src/messagewin.cpp b/src/messagewin.cpp
--- a/src/messagewin.cpp
+++ b/src/messagewin.cpp
@@ -48,7 +48,6 @@
 #include <KStandardGuiItem>
 #include <KLocalizedString>
 #include <KConfig>
-#include <KIconLoader>
 #include <KTextEdit>
 #include <KWindowSystem>
 #include <KIO/StatJob>
@@ -603,7 +602,7 @@
         layout->addStretch();
         topLayout->addLayout(layout);
         QLabel* label = new QLabel(topWidget);
-        label->setPixmap(QIcon::fromTheme(QStringLiteral("dialog-error")).pixmap(IconSize(KIconLoader::Desktop), IconSize(KIconLoader::Desktop)));
+        label->setPixmap(QIcon::fromTheme(QStringLiteral("dialog-error")).pixmap(style()->pixelMetric(QStyle::PM_MessageBoxIconSize)));
         label->setFixedSize(label->sizeHint());
         layout->addWidget(label, 0, Qt::AlignRight);
         QVBoxLayout* vlayout = new QVBoxLayout();
@@ -663,13 +662,11 @@
     else
         setDeferralLimit(mEvent);    // ensure that button is disabled when alarm can't be deferred any more
 
-    KIconLoader iconLoader;
     if (!mAudioFile.isEmpty()  &&  (mVolume || mFadeVolume > 0))
     {
         // Silence button to stop sound repetition
-        const QPixmap pixmap = iconLoader.loadIcon(QStringLiteral("media-playback-stop"), KIconLoader::MainToolbar);
         mSilenceButton = new PushButton(topWidget);
-        mSilenceButton->setIcon(pixmap);
+        mSilenceButton->setIcon(QIcon::fromTheme(QStringLiteral("media-playback-stop")));
         grid->addWidget(mSilenceButton, 0, gridIndex++, Qt::AlignHCenter);
         mSilenceButton->setToolTip(i18nc("@info:tooltip", "Stop sound"));
         mSilenceButton->setWhatsThis(i18nc("@info:whatsthis", "Stop playing the sound"));
@@ -680,19 +677,17 @@
     if (mAkonadiItemId >= 0)
     {
         // KMail button
-        const QPixmap pixmap = iconLoader.loadIcon(QStringLiteral("internet-mail"), KIconLoader::MainToolbar);
         mKMailButton = new PushButton(topWidget);
-        mKMailButton->setIcon(pixmap);
+        mKMailButton->setIcon(QIcon::fromTheme(QStringLiteral("internet-mail")));
         connect(mKMailButton, &QAbstractButton::clicked, this, &MessageWin::slotShowKMailMessage);
         grid->addWidget(mKMailButton, 0, gridIndex++, Qt::AlignHCenter);
         mKMailButton->setToolTip(xi18nc("@info:tooltip Locate this email in KMail", "Locate in <application>KMail</application>"));
         mKMailButton->setWhatsThis(xi18nc("@info:whatsthis", "Locate and highlight this email in <application>KMail</application>"));
     }
 
     // KAlarm button
-    const QPixmap pixmap = iconLoader.loadIcon(KAboutData::applicationData().componentName(), KIconLoader::MainToolbar);
     mKAlarmButton = new PushButton(topWidget);
-    mKAlarmButton->setIcon(pixmap);
+    mKAlarmButton->setIcon(QIcon::fromTheme(KAboutData::applicationData().componentName()));
     connect(mKAlarmButton, &QAbstractButton::clicked, this, &MessageWin::displayMainWindow);
     grid->addWidget(mKAlarmButton, 0, gridIndex++, Qt::AlignHCenter);
     mKAlarmButton->setToolTip(xi18nc("@info:tooltip", "Activate <application>KAlarm</application>"));
diff --git a/src/traywindow.cpp b/src/traywindow.cpp
--- a/src/traywindow.cpp
+++ b/src/traywindow.cpp
@@ -42,7 +42,6 @@
 #include <KMessageBox>
 #include <KStandardAction>
 #include <KStandardGuiItem>
-#include <KIconEffect>
 #include <KConfig>
 #include <KAboutData>