diff --git a/coursera/filtering.py b/coursera/filtering.py
index 14f4116..4331831 100644
--- a/coursera/filtering.py
+++ b/coursera/filtering.py
@@ -95,15 +95,15 @@ def find_resources_to_get(lecture, file_formats, resource_filter, ignored_format
 
     for fmt, resources in iteritems(lecture):
         fmt0 = fmt
+
+        short_fmt = None
         if '.' in fmt:
             short_fmt = fmt.split('.')[1]
-        else:
-            short_fmt = None
 
-        if fmt in ignored_formats or short_fmt in ignored_formats:
+        if fmt in ignored_formats or (short_fmt != None and short_fmt in ignored_formats) :
             continue
 
-        if fmt in file_formats or short_fmt in file_formats or 'all' in file_formats:
+        if fmt in file_formats or (short_fmt != None and short_fmt in file_formats) or 'all' in file_formats:
             for r in resources:
                 if resource_filter and r[1] and not re.search(resource_filter, r[1]):
                     logging.debug('Skipping b/c of rf: %s %s',