diff --git a/hepcrawl/spiders/wsp_spider.py b/hepcrawl/spiders/wsp_spider.py
index 1f0786d3..5400621c 100644
--- a/hepcrawl/spiders/wsp_spider.py
+++ b/hepcrawl/spiders/wsp_spider.py
@@ -14,7 +14,6 @@
 import os
 import urlparse
 import tempfile
-import shutil
 
 from scrapy import Request
 from scrapy.spiders import XMLFeedSpider
@@ -214,10 +213,12 @@ def parse_node(self, response, node):
 
         return parsed_record
 
-    def _get_collections(self, node, article_type, current_journal_title):
+    @staticmethod
+    def _get_collections(node, article_type, current_journal_title):
         """Return this articles' collection."""
         conference = node.xpath('.//conference').extract()
-        if conference or current_journal_title == "International Journal of Modern Physics: Conference Series":
+        if conference or current_journal_title == "International Journal of Modern Physics:" \
+                                                  " Conference Series":
             return ['HEP', 'ConferencePaper']
         elif article_type == "review-article":
             return ['HEP', 'Review']