diff --git a/odf2legi/odf2legi.py b/odf2legi/odf2legi.py
index 68d417b..10c9c4f 100644
--- a/odf2legi/odf2legi.py
+++ b/odf2legi/odf2legi.py
@@ -787,6 +787,7 @@ def convert(input_filename, output_filename):
     z = zipfile.ZipFile(input_filename)
     content = None
     metadata = None
+    styles = None
     for zfile in z.namelist():
         if zfile == 'content.xml':
             content = z.read(zfile)