diff --git a/hgext3rd/fbsparse.py b/hgext3rd/fbsparse.py
--- a/hgext3rd/fbsparse.py
+++ b/hgext3rd/fbsparse.py
@@ -1161,26 +1161,26 @@
     """
     ctx = repo['.']
     mf = ctx.manifest()
-    cwd = util.normpath(os.getcwd())
 
     # Get the root of the repo so that we remove the content of
     # the root from the current working directory
     root = repo.root
-    if cwd.startswith(root):
-        cwd = cwd[len(root):]
-    else:
-        raise error.Abort(_("the current working directory should begin " +
-            "with the root %s") % root)
+    cwd = util.normpath(os.getcwd())
+    cwd = os.path.relpath(cwd, root)
+    cwd = '' if cwd == os.curdir else cwd + os.sep
+    if cwd.startswith(os.pardir + os.sep):
+        raise error.Abort(
+            _("the current working directory should begin "
+              "with the root %s") % root)
 
-    cwd = cwd.strip("/")
     sparsematch = repo.sparsematch(ctx.rev())
     checkedoutentries = set()
     allentries = set()
-    cwdlength = len(cwd) + 1
+    cwdlength = len(cwd)
+
     for filepath in mf:
         if filepath.startswith(cwd):
-            tail = filepath[cwdlength:] if cwdlength > 1 else filepath
-            entryname = tail.split('/', 1)[0]
+            entryname = filepath[cwdlength:].partition(os.sep)[0]
 
             allentries.add(entryname)
             if sparsematch(filepath):