diff --git a/dedrm_src/wineutils.py b/dedrm_src/wineutils.py
index 0485e5e..df1755f 100644
--- a/dedrm_src/wineutils.py
+++ b/dedrm_src/wineutils.py
@@ -6,7 +6,7 @@ from __future__ import with_statement
 __license__ = 'GPL v3'
 
 # Standard Python modules.
-import os, sys, re, hashlib
+import os, sys, re, hashlib, traceback
 from calibre_plugins.dedrm.__init__ import PLUGIN_NAME, PLUGIN_VERSION
 
 def WineGetKeys(scriptpath, extension, wineprefix=""):