diff --git a/osc/commandline.py b/osc/commandline.py
index 847b3362..8e194e61 100755
--- a/osc/commandline.py
+++ b/osc/commandline.py
@@ -456,8 +456,8 @@ class Osc(cmdln.Cmdln):
             if opts.diff:
                 try:
                     print pretty_diff(conf.config['apiurl'],
-                                      r.src_project, r.src_package, r.src_md5,
-                                      r.dst_project, r.dst_package, None)
+                                      r.dst_project, r.dst_package, None,
+                                      r.src_project, r.src_package, r.src_md5)
                 except urllib2.HTTPError, e:
                     print >>sys.stderr, 'Diff not possible:', e