diff --git a/app/controllers/mixins/generic_list_mixin.rb b/app/controllers/mixins/generic_list_mixin.rb
index de64625bd58..df02de01ee8 100644
--- a/app/controllers/mixins/generic_list_mixin.rb
+++ b/app/controllers/mixins/generic_list_mixin.rb
@@ -5,6 +5,7 @@ def index
     end
 
     def show_list
+      @showtype = nil
       @center_toolbar = self.class.toolbar_plural if self.class.toolbar_plural
       process_show_list
     end