diff --git a/mercurial/statichttprepo.py b/mercurial/statichttprepo.py
--- a/mercurial/statichttprepo.py
+++ b/mercurial/statichttprepo.py
@@ -115,9 +115,7 @@ class statichttprepository(localrepo.loc
                 raise error.RepoError(_("requirement '%s' not supported") % r)
 
         # setup store
-        def pjoin(a, b):
-            return a + '/' + b
-        self.store = store.store(requirements, self.path, opener, pjoin)
+        self.store = store.store(requirements, self.path, opener)
         self.spath = self.store.path
         self.sopener = self.store.opener
         self.sjoin = self.store.join
diff --git a/mercurial/store.py b/mercurial/store.py
--- a/mercurial/store.py
+++ b/mercurial/store.py
@@ -169,8 +169,7 @@ def _calcmode(path):
 
 class basicstore(object):
     '''base class for local repository stores'''
-    def __init__(self, path, opener, pathjoiner):
-        self.pathjoiner = pathjoiner
+    def __init__(self, path, opener):
         self.path = path
         self.createmode = _calcmode(path)
         op = opener(self.path)
@@ -178,19 +177,21 @@ class basicstore(object):
         self.opener = lambda f, *args, **kw: op(encodedir(f), *args, **kw)
 
     def join(self, f):
-        return self.pathjoiner(self.path, encodedir(f))
+        return self.path + '/' + encodedir(f)
 
     def _walk(self, relpath, recurse):
         '''yields (unencoded, encoded, size)'''
-        path = self.pathjoiner(self.path, relpath)
-        striplen = len(self.path) + len(os.sep)
+        path = self.path
+        if relpath:
+            path += '/' + relpath
+        striplen = len(self.path) + 1
         l = []
         if os.path.isdir(path):
             visit = [path]
             while visit:
                 p = visit.pop()
                 for f, kind, st in osutil.listdir(p, stat=True):
-                    fp = self.pathjoiner(p, f)
+                    fp = p + '/' + f
                     if kind == stat.S_IFREG and f[-2:] in ('.d', '.i'):
                         n = util.pconvert(fp[striplen:])
                         l.append((decodedir(n), n, st.st_size))
@@ -217,9 +218,8 @@ class basicstore(object):
         pass
 
 class encodedstore(basicstore):
-    def __init__(self, path, opener, pathjoiner):
-        self.pathjoiner = pathjoiner
-        self.path = self.pathjoiner(path, 'store')
+    def __init__(self, path, opener):
+        self.path = path + '/store'
         self.createmode = _calcmode(self.path)
         op = opener(self.path)
         op.createmode = self.createmode
@@ -234,11 +234,11 @@ class encodedstore(basicstore):
             yield a, b, size
 
     def join(self, f):
-        return self.pathjoiner(self.path, encodefilename(f))
+        return self.path + '/' + encodefilename(f)
 
     def copylist(self):
         return (['requires', '00changelog.i'] +
-                [self.pathjoiner('store', f) for f in _data.split()])
+                ['store/' + f for f in _data.split()])
 
 class fncache(object):
     # the filename used to be partially encoded
@@ -299,10 +299,9 @@ class fncache(object):
         return iter(self.entries)
 
 class fncachestore(basicstore):
-    def __init__(self, path, opener, pathjoiner, encode):
+    def __init__(self, path, opener, encode):
         self.encode = encode
-        self.pathjoiner = pathjoiner
-        self.path = self.pathjoiner(path, 'store')
+        self.path = path + '/store'
         self.createmode = _calcmode(self.path)
         op = opener(self.path)
         op.createmode = self.createmode
@@ -316,17 +315,16 @@ class fncachestore(basicstore):
         self.opener = fncacheopener
 
     def join(self, f):
-        return self.pathjoiner(self.path, self.encode(f))
+        return self.path + '/' + self.encode(f)
 
     def datafiles(self):
         rewrite = False
         existing = []
-        pjoin = self.pathjoiner
         spath = self.path
         for f in self.fncache:
             ef = self.encode(f)
             try:
-                st = os.stat(pjoin(spath, ef))
+                st = os.stat(spath + '/' + ef)
                 yield f, ef, st.st_size
                 existing.append(f)
             except OSError:
@@ -341,17 +339,16 @@ class fncachestore(basicstore):
         d = ('data dh fncache'
              ' 00manifest.d 00manifest.i 00changelog.d 00changelog.i')
         return (['requires', '00changelog.i'] +
-                [self.pathjoiner('store', f) for f in d.split()])
+                ['store/' + f for f in d.split()])
 
     def write(self):
         self.fncache.write()
 
-def store(requirements, path, opener, pathjoiner=None):
-    pathjoiner = pathjoiner or os.path.join
+def store(requirements, path, opener):
     if 'store' in requirements:
         if 'fncache' in requirements:
             auxencode = lambda f: _auxencode(f, 'dotencode' in requirements)
             encode = lambda f: _hybridencode(f, auxencode)
-            return fncachestore(path, opener, pathjoiner, encode)
-        return encodedstore(path, opener, pathjoiner)
-    return basicstore(path, opener, pathjoiner)
+            return fncachestore(path, opener, encode)
+        return encodedstore(path, opener)
+    return basicstore(path, opener)