diff --git a/_data/rules.yml b/_data/rules.yml
index f57c347..7f5e4fe 100644
--- a/_data/rules.yml
+++ b/_data/rules.yml
@@ -788,7 +788,7 @@ groups:
                 severity: critical
               - name: MongoDB replication lag
                 description: Mongodb replication lag is more than 10s
-                query: 'mongodb_rs_members_optimeDate{member_state="PRIMARY"} - on (set) group_right mongodb_rs_members_optimeDate{member_state="SECONDARY"} > 10'
+                query: '(mongodb_rs_members_optimeDate{member_state="PRIMARY"} - on (set) group_right mongodb_rs_members_optimeDate{member_state="SECONDARY"}) / 1000 > 10'
                 severity: critical
               - name: MongoDB replication headroom
                 description: MongoDB replication headroom is <= 0