diff --git a/bgpranking/ranking.py b/bgpranking/ranking.py
index 0277863..9a2c157 100644
--- a/bgpranking/ranking.py
+++ b/bgpranking/ranking.py
@@ -75,7 +75,7 @@ class Ranking():
     def compute(self):
         self.logger.info('Start ranking')
         set_running(self.__class__.__name__)
-        if self.asn_meta.exists('v4|last', 'v6|last') != 2:
+        if self.asn_meta.exists('v4|last') and self.asn_meta.exists('v6|last'):
             '''Failsafe if asn_meta has not been populated yet'''
             unset_running(self.__class__.__name__)
             return