diff --git a/hgext3rd/pushrebase.py b/hgext3rd/pushrebase.py
--- a/hgext3rd/pushrebase.py
+++ b/hgext3rd/pushrebase.py
@@ -930,8 +930,8 @@
     return 1
 
 def prepushrebasehooks(op, params, bundle, bundlefile):
-    prelockonto = resolveonto(op.repo,
-                              params.get('onto', donotrebasemarker))
+    onto = params.get('onto')
+    prelockonto = resolveonto(op.repo, onto or donotrebasemarker)
     prelockontonode = prelockonto.hex() if prelockonto else None
 
     # Allow running hooks on the new commits before we take the lock
@@ -941,6 +941,8 @@
     prelockrebaseargs['node'] = scmutil.revsingle(bundle,
                                                   'min(bundle())').hex()
     prelockrebaseargs['node_onto'] = prelockontonode
+    if onto:
+        prelockrebaseargs['onto'] = onto
     prelockrebaseargs['hook_bundlepath'] = bundlefile
 
     for path in op.records[treepackrecords]:
diff --git a/tests/test-pushrebase.t b/tests/test-pushrebase.t
--- a/tests/test-pushrebase.t
+++ b/tests/test-pushrebase.t
@@ -615,7 +615,7 @@
   $ hg push --to master -B master
   pushing to $TESTTMP/hookserver (glob)
   searching for changes
-  prepushrebase hook: HG_BUNDLE2=1 HG_HOOKNAME=prepushrebase HG_HOOKTYPE=prepushrebase HG_HOOK_BUNDLEPATH=* HG_NODE=4fcee35c508c1019667f72cae9b843efa8908701 HG_NODE_ONTO=e95be919ac60f0c114075e32a0a4301afabadb60 HG_SOURCE=push (glob)
+  prepushrebase hook: HG_BUNDLE2=1 HG_HOOKNAME=prepushrebase HG_HOOKTYPE=prepushrebase HG_HOOK_BUNDLEPATH=* HG_NODE=4fcee35c508c1019667f72cae9b843efa8908701 HG_NODE_ONTO=e95be919ac60f0c114075e32a0a4301afabadb60 HG_ONTO=master HG_SOURCE=push (glob)
   prechangegroup hook: HG_BUNDLE2=1 HG_HOOKNAME=prechangegroup HG_HOOKTYPE=prechangegroup HG_SOURCE=push HG_TXNID=TXN:* HG_URL=file:$TESTTMP/hookserver (glob)
   pushing 3 changesets:
       4fcee35c508c  first