diff --git a/hgext/rebase.py b/hgext/rebase.py
--- a/hgext/rebase.py
+++ b/hgext/rebase.py
@@ -644,6 +644,12 @@
             repo['.'].node() == repo._bookmarks[self.activebookmark]):
                 bookmarks.activate(repo, self.activebookmark)
 
+    def _abortunfinishedrebase(self, backup=False, suppwarns=True):
+        repo = self.repo
+        with repo.wlock(), repo.lock():
+            retcode = self._prepareabortorcontinue(isabort=True)
+            return retcode
+
 @command('rebase',
     [('s', 'source', '',
      _('rebase the specified changeset and descendants'), _('REV')),
@@ -818,19 +824,7 @@
         opts[r'dest'] = '_destautoorphanrebase(SRC)'
 
     if dryrun:
-        try:
-            overrides = {('rebase', 'singletransaction'): True}
-            with ui.configoverride(overrides, 'rebase'):
-                _origrebase(ui, repo, inmemory=True, leaveunfinished=True,
-                            **opts)
-        except error.InMemoryMergeConflictsError:
-            ui.status(_('hit a merge conflict\n'))
-            return 1
-        else:
-            ui.status(_('there will be no conflict, you can rebase\n'))
-            return 0
-        finally:
-            _origrebase(ui, repo, abort=True)
+        return _dryrunrebase(ui, repo, **opts)
     elif inmemory:
         try:
             # in-memory merge doesn't support conflicts, so if we hit any, abort
@@ -846,6 +840,24 @@
     else:
         return _origrebase(ui, repo, **opts)
 
+def _dryrunrebase(ui, repo, **opts):
+    leaveunfinished = True
+    inmemory = True
+    rbsrt = rebaseruntime(repo, ui, inmemory, opts)
+    try:
+        overrides = {('rebase', 'singletransaction'): True}
+        with ui.configoverride(overrides, 'rebase'):
+            _origrebase(ui, repo, inmemory=True,
+                        leaveunfinished=leaveunfinished, **opts)
+    except error.InMemoryMergeConflictsError:
+        ui.status(_('hit a merge conflict\n'))
+        return 1
+    else:
+        ui.status(_('there will be no conflict, you can rebase\n'))
+        return 0
+    finally:
+        rbsrt._abortunfinishedrebase()
+
 def _origrebase(ui, repo, inmemory=False, leaveunfinished=False, **opts):
     opts = pycompat.byteskwargs(opts)
     rbsrt = rebaseruntime(repo, ui, inmemory, opts)