diff --git a/bitbake/lib/bb/fetch2/osc.py b/bitbake/lib/bb/fetch2/osc.py
index d9ce44390c..99a529e5bf 100644
--- a/bitbake/lib/bb/fetch2/osc.py
+++ b/bitbake/lib/bb/fetch2/osc.py
@@ -43,7 +43,7 @@ class Osc(FetchMethod):
             ud.revision = ud.parm['rev']
         else:
             pv = d.getVar("PV", False)
-            rev = bb.fetch2.srcrev_internal_helper(ud, d)
+            rev = bb.fetch2.srcrev_internal_helper(ud, d, '')
             if rev:
                 ud.revision = rev
             else: