diff --git a/crates/core/database/src/models/server_members/ops/mongodb.rs b/crates/core/database/src/models/server_members/ops/mongodb.rs
index f9db0d35..849e7a85 100644
--- a/crates/core/database/src/models/server_members/ops/mongodb.rs
+++ b/crates/core/database/src/models/server_members/ops/mongodb.rs
@@ -35,7 +35,7 @@ impl AbstractServerMembers for MongoDb {
                     },
                     doc! {
                         "$set": {
-                            "joined_at": member.joined_at.duration_since(Timestamp::UNIX_EPOCH).whole_seconds(),
+                            "joined_at": member.joined_at.duration_since(Timestamp::UNIX_EPOCH).whole_milliseconds() as i64,
                         },
                         "$unset": {
                             "pending_deletion_at": ""