diff --git a/openlp/plugins/presentations/lib/mediaitem.py b/openlp/plugins/presentations/lib/mediaitem.py
index fcfc495ed..cef30a498 100644
--- a/openlp/plugins/presentations/lib/mediaitem.py
+++ b/openlp/plugins/presentations/lib/mediaitem.py
@@ -80,15 +80,15 @@ class PresentationMediaItem(MediaManagerItem):
         """
         Build the list of file extensions to be used in the Open file dialog.
         """
-        file_type = u''
+        file_type_list = u''
         for controller in self.controllers:
             if self.controllers[controller].enabled():
                 file_types = self.controllers[controller].supports + self.controllers[controller].also_supports
                 for file_type in file_types:
                     if file_type.find(file_type) == -1:
-                        file_type += u'*.%s ' % file_type
+                        file_type_list += u'*.%s ' % file_type
                         self.service_manager.supported_suffixes(file_type)
-        self.on_new_file_masks = translate('PresentationPlugin.MediaItem', 'Presentations (%s)') % file_type
+        self.on_new_file_masks = translate('PresentationPlugin.MediaItem', 'Presentations (%s)') % file_type_list
 
     def required_icons(self):
         """