diff --git a/src/calibre/ebooks/snb/input.py b/src/calibre/ebooks/snb/input.py
index 052db6d059..8343d44301 100755
--- a/src/calibre/ebooks/snb/input.py
+++ b/src/calibre/ebooks/snb/input.py
@@ -62,7 +62,7 @@ class SNBInput(InputFormatPlugin):
                 oeb.uid = oeb.metadata.identifier[0]
                 break
 
-        with TemporaryDirectory('_chm2oeb', keep=True) as tdir:
+        with TemporaryDirectory('_snb2oeb', keep=True) as tdir:
             log.debug('Process TOC ...')
             toc = snbFile.GetFileStream('snbf/toc.snbf')
             oeb.container = DirContainer(tdir, log)