diff --git a/mercurial/merge.py b/mercurial/merge.py
--- a/mercurial/merge.py
+++ b/mercurial/merge.py
@@ -1183,9 +1183,8 @@
     _prefetchfiles(repo, mctx, actions)
 
     updated, merged, removed = 0, 0, 0
-    ms = mergestatemod.mergestate.clean(
-        repo, wctx.p1().node(), mctx.node(), labels
-    )
+    ms = wctx.mergestate(clean=True)
+    ms.reset(wctx.p1().node(), mctx.node(), labels)
 
     # add ACTION_GET_OTHER_AND_STORE to mergestate
     for e in actions[mergestatemod.ACTION_GET_OTHER_AND_STORE]:
@@ -1594,7 +1593,7 @@
         if not overwrite:
             if len(pl) > 1:
                 raise error.Abort(_(b"outstanding uncommitted merge"))
-            ms = mergestatemod.mergestate.read(repo)
+            ms = wc.mergestate()
             if ms.unresolvedcount():
                 raise error.Abort(
                     _(b"outstanding merge conflicts"),