@@ -197,7 +197,7 @@ class ResultContainer(object):
197197 result['parsed_url'] = result['parsed_url']._replace(scheme="http")
198198 result['url'] = result['parsed_url'].geturl()
199199
200− result['engines'] = [result['engine']]
200+ result['engines'] = set([result['engine']])
201201
202202 # strip multiple spaces and cariage returns from content
203203 if result.get('content'):
@@ -227,7 +227,7 @@ class ResultContainer(object):
227227 duplicated['positions'].append(position)
228228
229229 # add engine to list of result-engines
230− duplicated['engines'].append(result['engine'])
230+ duplicated['engines'].add(result['engine'])
231231
232232 # using https if possible
233233 if duplicated['parsed_url'].scheme != 'https' and result['parsed_url'].scheme == 'https':