diff --git a/app/logical/downloads/rewrite_strategies/tumblr.rb b/app/logical/downloads/rewrite_strategies/tumblr.rb
index 7fd198a06..7ea3c8296 100644
--- a/app/logical/downloads/rewrite_strategies/tumblr.rb
+++ b/app/logical/downloads/rewrite_strategies/tumblr.rb
@@ -12,7 +12,7 @@ module Downloads
 
     protected
       def rewrite_thumbnails(url, headers)
-        if url =~ %r{^http?://.+\.tumblr\.com/(?:\w+/)?(?:tumblr_)?(\w+_)(\d+)\..+$}
+        if url =~ %r{^https?://.+\.tumblr\.com/(?:\w+/)?(?:tumblr_)?(\w+_)(\d+)\..+$}
           match = $1
           given_size = $2