diff --git a/applets/taskmanager/package/contents/ui/Task.qml b/applets/taskmanager/package/contents/ui/Task.qml
--- a/applets/taskmanager/package/contents/ui/Task.qml
+++ b/applets/taskmanager/package/contents/ui/Task.qml
@@ -367,7 +367,7 @@
                         return model.GenericName;
                     });
                     toolTipDelegate.virtualDesktopParent = Qt.binding(function() {
-                        return model.VirtualDesktop != undefined ? model.VirtualDesktop : 0;
+                        return (model.VirtualDesktops != undefined || model.VirtualDesktops.length == 0) ? model.VirtualDesktops : [0];
                     });
                     toolTipDelegate.isOnAllVirtualDesktopsParent = Qt.binding(function() {
                         return model.IsOnAllVirtualDesktops == true;
diff --git a/applets/taskmanager/package/contents/ui/ToolTipDelegate.qml b/applets/taskmanager/package/contents/ui/ToolTipDelegate.qml
--- a/applets/taskmanager/package/contents/ui/ToolTipDelegate.qml
+++ b/applets/taskmanager/package/contents/ui/ToolTipDelegate.qml
@@ -53,7 +53,7 @@
     // Needed for generateSubtext()
     property string displayParent
     property string genericName
-    property int virtualDesktopParent
+    property var virtualDesktopParent
     property bool isOnAllVirtualDesktopsParent
     property var activitiesParent
     //
diff --git a/applets/taskmanager/package/contents/ui/ToolTipInstance.qml b/applets/taskmanager/package/contents/ui/ToolTipInstance.qml
--- a/applets/taskmanager/package/contents/ui/ToolTipInstance.qml
+++ b/applets/taskmanager/package/contents/ui/ToolTipInstance.qml
@@ -434,15 +434,18 @@
 
         var subTextEntries = [];
 
-        var vd = isGroup ? VirtualDesktop : virtualDesktopParent;
+        var virtualDesktops = isGroup ? VirtualDesktops : virtualDesktopParent;
+        var virtualDesktopNameList = new Array();
+
+        for (var i = 0; i < virtualDesktops.length; ++i) {
+            virtualDesktopNameList.push(virtualDesktopInfo.desktopNames[virtualDesktops[i] - 1]);
+        }
 
         if (!plasmoid.configuration.showOnlyCurrentDesktop
             && virtualDesktopInfo.numberOfDesktops > 1
             && (isGroup ? IsOnAllVirtualDesktops : isOnAllVirtualDesktopsParent) !== true
-            && vd != -1
-            && vd != undefined
-            && virtualDesktopInfo.desktopNames[vd - 1] != undefined) {
-            subTextEntries.push(i18n("On %1", virtualDesktopInfo.desktopNames[vd - 1]));
+            && virtualDesktops.length > 0) {
+            subTextEntries.push(i18nc("Comma-separated list of desktops", "On %1", virtualDesktopNameList.join()));
         }
 
         var act = isGroup ? Activities : activitiesParent;