--- a/mercurial/dirstate.py
+++ b/mercurial/dirstate.py
@@ -391,16 +391,8 @@
         # use the modification time of the newly created temporary file as the
         # filesystem's notion of 'now'
         now = int(util.fstat(st).st_mtime)
-
-        cs = cStringIO.StringIO()
-        copymap = self._copymap
-        pack = struct.pack
-        write = cs.write
-        write("".join(self._pl))
-        for f, e in self._map.iteritems():
-            if f in copymap:
-                f = "%s\0%s" % (f, copymap[f])
-
+        for f in self._map.keys():
+            e = self._map[f]
             if e[0] == 'n' and e[3] == now:
                 # The file was last modified "simultaneously" with the current
                 # write to dirstate (i.e. within the same second for file-
@@ -411,8 +403,16 @@
                 # dirstate, forcing future 'status' calls to compare the
                 # contents of the file. This prevents mistakenly treating such
                 # files as clean.
-                e = (e[0], 0, -1, -1)   # mark entry as 'unset'
+                self._map[f] = (e[0], 0, -1, -1)   # mark entry as 'unset'
 
+        cs = cStringIO.StringIO()
+        copymap = self._copymap
+        pack = struct.pack
+        write = cs.write
+        write("".join(self._pl))
+        for f, e in self._map.iteritems():
+            if f in copymap:
+                f = "%s\0%s" % (f, copymap[f])
             e = pack(_format, e[0], e[1], e[2], e[3], len(f))
             write(e)
             write(f)

new file mode 100755
--- /dev/null
+++ b/tests/test-status-inprocess.py
@@ -0,0 +1,32 @@
+#!/usr/bin/python
+import os
+from mercurial.ui import ui
+from mercurial.localrepo import localrepository
+from mercurial.commands import add, commit, status
+
+u = ui()
+
+print '% creating repo'
+repo = localrepository(u, '.', create=True)
+
+f = open('test.py', 'w')
+try:
+    f.write('foo\n')
+finally:
+    f.close
+
+print '% add and commit'
+add(u, repo, 'test.py')
+commit(u, repo, message='*')
+status(u, repo, clean=True)
+
+
+print '% change'
+f = open('test.py', 'w')
+try:
+    f.write('bar\n')
+finally:
+    f.close()
+
+# this would return clean instead of changed before the fix
+status(u, repo, clean=True, modified=True)

new file mode 100644
--- /dev/null
+++ b/tests/test-status-inprocess.py.out
@@ -0,0 +1,5 @@
+% creating repo
+% add and commit
+C test.py
+% change
+M test.py