diff --git a/src/calibre/ebooks/metadata/epub.py b/src/calibre/ebooks/metadata/epub.py
index e60837a553..e1712f3668 100644
--- a/src/calibre/ebooks/metadata/epub.py
+++ b/src/calibre/ebooks/metadata/epub.py
@@ -109,9 +109,11 @@ class OCFZipReader(OCFReader):
             raise EPubException("not a ZIP .epub OCF container")
         self.root = root
         if self.root is None:
-            self.root = os.getcwdu()
-            if hasattr(stream, 'name'):
-                self.root = os.path.abspath(os.path.dirname(stream.name))
+            name = getattr(stream, 'name', False)
+            if name:
+                self.root = os.path.abspath(os.path.dirname(name))
+            else:
+                self.root = os.getcwdu()
         super(OCFZipReader, self).__init__()
 
     def open(self, name, mode='r'):