diff --git a/shared/simplestreams/simplestreams.go b/shared/simplestreams/simplestreams.go
index <HASH>..<HASH> 100644
--- a/shared/simplestreams/simplestreams.go
+++ b/shared/simplestreams/simplestreams.go
@@ -148,7 +148,7 @@ func (s *SimpleStreams) parseStream() (*Stream, error) {
 		return s.cachedStream, nil
 	}
 
-	body, err := s.cachedDownload("/streams/v1/index.json")
+	body, err := s.cachedDownload("streams/v1/index.json")
 	if err != nil {
 		return nil, err
 	}
shared/simplestreams: Fix stream's index download url

Since commit aef8f<I> ("shared/simplestreams: Implement caching support")
the index url contains double '/' between the host part and the path part,
so the resulting url looks like:
  <URL>, by removing the prepended '/' passed to
s.cachedDownload().