diff --git a/src/imports/activitymodel.h b/src/imports/activitymodel.h
--- a/src/imports/activitymodel.h
+++ b/src/imports/activitymodel.h
@@ -24,6 +24,7 @@
 #include <QObject>
 #include <QAbstractListModel>
 #include <QJSValue>
+#include <QCollator>
 
 // STL and Boost
 #include <boost/container/flat_set.hpp>
@@ -130,12 +131,14 @@
     struct InfoPtrComparator {
         bool operator() (const InfoPtr& left, const InfoPtr& right) const
         {
-            const QString &leftName = left->name().toLower();
-            const QString &rightName = right->name().toLower();
-
-            return
-                (leftName < rightName) ||
-                (leftName == rightName && left->id() < right->id());
+            QCollator c;
+            c.setCaseSensitivity(Qt::CaseInsensitive);
+            c.setNumericMode(true);
+            int rc = c.compare(left->name(), right->name());
+            if (rc == 0) {
+                return left->id() < right->id();
+            }
+            return rc < 0;
         }
     };
 
diff --git a/src/lib/activitiesmodel_p.h b/src/lib/activitiesmodel_p.h
--- a/src/lib/activitiesmodel_p.h
+++ b/src/lib/activitiesmodel_p.h
@@ -28,6 +28,8 @@
 
 #include "utils/qflatset.h"
 
+#include <QCollator>
+
 namespace KActivities {
 
 class ActivitiesModelPrivate : public QObject {
@@ -57,12 +59,14 @@
     struct InfoPtrComparator {
         bool operator() (const InfoPtr& left, const InfoPtr& right) const
         {
-            const QString &leftName = left->name().toLower();
-            const QString &rightName = right->name().toLower();
-
-            return
-                (leftName < rightName) ||
-                (leftName == rightName && left->id() < right->id());
+            QCollator c;
+            c.setCaseSensitivity(Qt::CaseInsensitive);
+            c.setNumericMode(true);
+            int rc = c.compare(left->name(), right->name());
+            if (rc == 0) {
+                return left->id() < right->id();
+            }
+            return rc < 0;
         }
     };