diff --git a/lib/client-sessions.js b/lib/client-sessions.js
index a8d91ea..1459a74 100644
--- a/lib/client-sessions.js
+++ b/lib/client-sessions.js
@@ -492,7 +492,7 @@ Session.prototype = {
         this.reset();
       // if expiration is soon, push back a few minutes to not interrupt user
       } else if (expiresAt - now < this.activeDuration) {
-        this.createdAt += this.activeDuration;
+        this.createdAt = (now + this.activeDuration) - this.duration;
         this.dirty = true;
         this.updateDefaultExpires();
       }