diff --git a/schema.py b/schema.py
index a8fc24e..0362b9e 100644
--- a/schema.py
+++ b/schema.py
@@ -249,7 +249,6 @@ def validate(self, data):
         i = self._ignore_extra_keys
         flavor = _priority(s)
         if flavor == ITERABLE:
-            data = Schema(type(s), error=e).validate(data)
             o = Or(*s, error=e, schema=Schema, ignore_extra_keys=i)
             return type(data)(o.validate(d) for d in data)
         if flavor == DICT: