diff --git a/src/kstatusnotifieritem.cpp b/src/kstatusnotifieritem.cpp
--- a/src/kstatusnotifieritem.cpp
+++ b/src/kstatusnotifieritem.cpp
@@ -586,8 +586,14 @@
     {
         QVariantMap hints;
 
-        if (!qApp->desktopFileName().isEmpty()) {
-            hints.insert(QStringLiteral("desktop-entry"), qApp->desktopFileName());
+        QString desktopFileName = QGuiApplication::desktopFileName();
+        if (!desktopFileName.isEmpty()) {
+            // handle apps which set the desktopFileName property with filename suffix,
+            // due to unclear API dox (https://bugreports.qt.io/browse/QTBUG-75521)
+            if (desktopFileName.endsWith(QLatin1String(".desktop"))) {
+                desktopFileName.chop(8);
+            }
+            hints.insert(QStringLiteral("desktop-entry"), desktopFileName);
         }
 
         d->notificationsClient->Notify(d->title, id, icon, title, message, QStringList(), hints, timeout);
diff --git a/src/notifybyaudio_canberra.cpp b/src/notifybyaudio_canberra.cpp
--- a/src/notifybyaudio_canberra.cpp
+++ b/src/notifybyaudio_canberra.cpp
@@ -46,9 +46,15 @@
         return;
     }
 
+    QString desktopFileName = QGuiApplication::desktopFileName();
+    // handle apps which set the desktopFileName property with filename suffix,
+    // due to unclear API dox (https://bugreports.qt.io/browse/QTBUG-75521)
+    if (desktopFileName.endsWith(QLatin1String(".desktop"))) {
+        desktopFileName.chop(8);
+    }
     ret = ca_context_change_props(m_context,
         CA_PROP_APPLICATION_NAME, qUtf8Printable(qApp->applicationDisplayName()),
-        CA_PROP_APPLICATION_ID, qUtf8Printable(qApp->desktopFileName()),
+        CA_PROP_APPLICATION_ID, qUtf8Printable(desktopFileName),
         CA_PROP_APPLICATION_ICON_NAME, qUtf8Printable(qApp->windowIcon().name()),
         nullptr);
     if (ret != CA_SUCCESS) {
diff --git a/src/notifybypopup.cpp b/src/notifybypopup.cpp
--- a/src/notifybypopup.cpp
+++ b/src/notifybypopup.cpp
@@ -708,8 +708,14 @@
         hintsMap[QStringLiteral("transient")] = true;
     }
 
-    if (!qApp->desktopFileName().isEmpty()) {
-        hintsMap[QStringLiteral("desktop-entry")] = qApp->desktopFileName();
+    QString desktopFileName = QGuiApplication::desktopFileName();
+    if (!desktopFileName.isEmpty()) {
+        // handle apps which set the desktopFileName property with filename suffix,
+        // due to unclear API dox (https://bugreports.qt.io/browse/QTBUG-75521)
+        if (desktopFileName.endsWith(QLatin1String(".desktop"))) {
+            desktopFileName.chop(8);
+        }
+        hintsMap[QStringLiteral("desktop-entry")] = desktopFileName;
     }
 
     int urgency = -1;