--- a/mercurial/context.py	Thu May 18 17:11:01 2017 -0400
+++ b/mercurial/context.py	Thu May 18 17:11:07 2017 -0400
@@ -1447,13 +1447,12 @@
 
         """
 
-        self._repo.dirstate.beginparentchange()
-        for f in self.modified() + self.added():
-            self._repo.dirstate.normal(f)
-        for f in self.removed():
-            self._repo.dirstate.drop(f)
-        self._repo.dirstate.setparents(node)
-        self._repo.dirstate.endparentchange()
+        with self._repo.dirstate.parentchange():
+            for f in self.modified() + self.added():
+                self._repo.dirstate.normal(f)
+            for f in self.removed():
+                self._repo.dirstate.drop(f)
+            self._repo.dirstate.setparents(node)
 
         # write changes out explicitly, because nesting wlock at
         # runtime may prevent 'wlock.release()' in 'repo.commit()'