diff --git a/src/calibre/utils/filenames.py b/src/calibre/utils/filenames.py
index c843100157..d9fd12d466 100644
--- a/src/calibre/utils/filenames.py
+++ b/src/calibre/utils/filenames.py
@@ -203,6 +203,11 @@ def samefile_windows(src, dst):
     import win32file
     from pywintypes import error
 
+    samestring = (os.path.normcase(os.path.abspath(src)) ==
+            os.path.normcase(os.path.abspath(dst)))
+    if samestring:
+        return True
+
     def get_fileid(x):
         if isbytestring(x): x = x.decode(filesystem_encoding)
         try: