diff --git a/teuthology/scrape.py b/teuthology/scrape.py
index c474931a9..42caf3a4a 100644
--- a/teuthology/scrape.py
+++ b/teuthology/scrape.py
@@ -411,8 +411,8 @@ def _get_service_types(self, job):
         # Lines like:
         # 2014-08-22T20:07:18.668 ERROR:tasks.ceph:saw valgrind issue   <kind>Leak_DefinitelyLost</kind> in /var/log/ceph/valgrind/osd.3.log.gz
         valgrind_err_line = grep(os.path.join(job.path, "teuthology.log"), "</kind> in ")
-        valgrind_err_line = list(filter(None, valgrind_err_line)) # remove empty strings
-        valgrind_err_line = [line for line in valgrind_err_line if line.strip()] # remove blank space
+        # removes blank space, empty string and None
+        valgrind_err_line = [line for line in valgrind_err_line if line and line.strip()]
         for line in valgrind_err_line:
             match = re.search("<kind>(.+)</kind> in .+/(.+)", line)
             if not match: