diff --git a/containments/desktop/package/contents/ui/ConfigFilter.qml b/containments/desktop/package/contents/ui/ConfigFilter.qml
--- a/containments/desktop/package/contents/ui/ConfigFilter.qml
+++ b/containments/desktop/package/contents/ui/ConfigFilter.qml
@@ -36,7 +36,7 @@
     property alias cfg_filterMimeTypes: mimeTypesModel.checkedTypes
 
     PlasmaCore.SortFilterModel {
-        id: filderedMimeTypesModel
+        id: filteredMimeTypesModel
 
         sourceModel: Folder.MimeTypesModel {
             id: mimeTypesModel
@@ -49,6 +49,27 @@
 
         sortRole: mimeTypesView.getColumn(mimeTypesView.sortIndicatorColumn).role
         sortOrder: mimeTypesView.sortIndicatorOrder
+
+        function checkFiltered() {
+            var types = [];
+
+            for (var i = 0; i < count; ++i) {
+                types.push(get(i).name);
+            }
+
+            mimeTypesModel.checkedTypes = types;
+        }
+
+        function uncheckFiltered() {
+            var types = [];
+
+            for (var i = 0; i < count; ++i) {
+                types.push(get(i).name);
+            }
+
+            mimeTypesModel.checkedTypes = mimeTypesModel.checkedTypes.filter(function(x) {
+                return types.indexOf(x) < 0; });
+        }
     }
 
     ColumnLayout {
@@ -113,7 +134,7 @@
 
                 enabled: (filterMode.currentIndex > 0)
 
-                model: filderedMimeTypesModel
+                model: filteredMimeTypesModel
 
                 sortIndicatorVisible: true
                 sortIndicatorColumn: 2 // Default to sort by "File type".
@@ -215,9 +236,7 @@
 
                     text: i18n("Select All")
 
-                    onClicked: {
-                        mimeTypesModel.checkAll();
-                    }
+                    onClicked: filteredMimeTypesModel.checkFiltered()
                 }
 
                 Button {
@@ -228,9 +247,7 @@
 
                     text: i18n("Deselect All")
 
-                    onClicked: {
-                        mimeTypesModel.checkedTypes = "";
-                    }
+                    onClicked: filteredMimeTypesModel.uncheckFiltered()
                 }
             }
         }
diff --git a/containments/desktop/plugins/folder/mimetypesmodel.h b/containments/desktop/plugins/folder/mimetypesmodel.h
--- a/containments/desktop/plugins/folder/mimetypesmodel.h
+++ b/containments/desktop/plugins/folder/mimetypesmodel.h
@@ -39,8 +39,6 @@
         QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
         bool setData(const QModelIndex &index, const QVariant &value, int role) override;
 
-        Q_INVOKABLE void checkAll();
-
         int rowCount(const QModelIndex &parent = QModelIndex()) const override { Q_UNUSED(parent) return m_mimeTypesList.size(); }
 
         QStringList checkedTypes() const;
diff --git a/containments/desktop/plugins/folder/mimetypesmodel.cpp b/containments/desktop/plugins/folder/mimetypesmodel.cpp
--- a/containments/desktop/plugins/folder/mimetypesmodel.cpp
+++ b/containments/desktop/plugins/folder/mimetypesmodel.cpp
@@ -98,15 +98,6 @@
     return false;
 }
 
-void MimeTypesModel::checkAll()
-{
-    m_checkedRows = QVector<bool>(m_mimeTypesList.size(), true);
-
-    emit dataChanged(index(0, 0), index(m_mimeTypesList.size() - 1, 0), {Qt::CheckStateRole});
-
-    emit checkedTypesChanged();
-}
-
 int MimeTypesModel::indexOfType(const QString &name) const
 {
     for (int i = 0; i < m_mimeTypesList.size(); i++) {