diff --git a/product/ZSQLCatalog/SQLCatalog.py b/product/ZSQLCatalog/SQLCatalog.py
index 481757c1569f8152e8afbdb9a33e8160afb4d536..818e6df71131f2dad2acbf41aa5365efede9839b 100644
--- a/product/ZSQLCatalog/SQLCatalog.py
+++ b/product/ZSQLCatalog/SQLCatalog.py
@@ -915,7 +915,7 @@ class Catalog(Folder, Persistent, Acquisition.Implicit, ExtensionClass.Base):
 
     if RESPONSE and URL1:
       RESPONSE.redirect('%s/manage_catalogAdvanced?' \
-                        'manage_tabs_message=Catalog%20Cleared' % URL1)
+                        'manage_tabs_message=Catalog%%20Cleared' % URL1)
 
   def manage_catalogClearReserved(self, REQUEST=None, RESPONSE=None, URL1=None):
     """ clears the whole enchilada """