diff --git a/spring-session/src/main/java/org/springframework/session/data/mongo/MongoExpiringSession.java b/spring-session/src/main/java/org/springframework/session/data/mongo/MongoExpiringSession.java
index 57945a1f..6fcc22b4 100644
--- a/spring-session/src/main/java/org/springframework/session/data/mongo/MongoExpiringSession.java
+++ b/spring-session/src/main/java/org/springframework/session/data/mongo/MongoExpiringSession.java
@@ -116,7 +116,7 @@ public class MongoExpiringSession implements ExpiringSession {
 	}
 
 	public boolean isExpired() {
-		return new Date().after(this.expireAt);
+		return this.interval >= 0 && new Date().after(this.expireAt);
 	}
 
 	public Date getExpireAt() {