diff --git a/scrapy/linkextractor.py b/scrapy/linkextractor.py
index 5c2100d74..edbaed86e 100644
--- a/scrapy/linkextractor.py
+++ b/scrapy/linkextractor.py
@@ -17,5 +17,5 @@ IGNORED_EXTENSIONS = [
     'm4a',
 
     # other
-    'css', 'pdf', 'doc', 'exe', 'bin', 'rss', 'zip', 'rar',
+    'css', 'pdf', 'doc', 'exe', 'bin', 'rss', 'zip', 'rar', 'ppt',
 ]