diff --git a/manifest_xml.py b/manifest_xml.py
index fdc3177..3517c15 100644
--- a/manifest_xml.py
+++ b/manifest_xml.py
@@ -261,6 +261,8 @@
         revision = self.remotes[remoteName].revision or d.revisionExpr
         if not revision or revision != p.revisionExpr:
           e.setAttribute('revision', p.revisionExpr)
+        if p.upstream and p.upstream != p.revisionExpr:
+          e.setAttribute('upstream', p.upstream)
 
       for c in p.copyfiles:
         ce = doc.createElement('copyfile')