diff --git a/tools/themeupdate/themeupdate.py b/tools/themeupdate/themeupdate.py
index 7690c681..01b4ee1f 100755
--- a/tools/themeupdate/themeupdate.py
+++ b/tools/themeupdate/themeupdate.py
@@ -271,7 +271,7 @@ def x_fonts(data):
             return
     else: return
     while 1:
-        i, key = find_key(data, '.font')
+        i, key, nul = find_key(data, '.font')
         if i < 0:
             break
         out('Removing "' + key + '"\n')