diff --git a/product/ZSQLCatalog/SQLCatalog.py b/product/ZSQLCatalog/SQLCatalog.py
index 42bb4b4e734c08c19e847c56f4a787425004ca9b..eaf63d6ffa598d1746961433c8733bebe452fa2e 100644
--- a/product/ZSQLCatalog/SQLCatalog.py
+++ b/product/ZSQLCatalog/SQLCatalog.py
@@ -336,7 +336,7 @@ class Query(QueryMixin):
       elif range_value == 'nlt' :
         where_expression.append("%s > %s" % (key, query_max))
     elif isSimpleType(value) or isinstance(value, DateTime) \
-        or isinstance(value, (list, tuple)):
+        or (isinstance(value, (list, tuple)) and self.operator.upper() != 'IN'):
       # Convert into lists any value which contain a ;
       # Refer to _listGlobalActions DCWorkflow patch
       # for example of use
@@ -398,6 +398,10 @@ class Query(QueryMixin):
 
     elif value is None:
       where_expression.append("%s is NULL" % (key))
+    elif isinstance(value, (tuple, list)) and self.operator.upper() == 'IN':
+      escaped_value_list = [self._quoteSQLString(x) for x in value]
+      escaped_value_string = ', '.join(escaped_value_list)
+      where_expression.append("%s IN (%s)" % (key, escaped_value_string))
     else:
       where_expression.append("%s = %s" % 
            (self._quoteSQLKey(key), self._quoteSQLString(value)))