diff --git a/core/src/main/java/org/apache/shiro/subject/support/DelegatingSubject.java b/core/src/main/java/org/apache/shiro/subject/support/DelegatingSubject.java
index d5c19c440d..b96c97d1b2 100644
--- a/core/src/main/java/org/apache/shiro/subject/support/DelegatingSubject.java
+++ b/core/src/main/java/org/apache/shiro/subject/support/DelegatingSubject.java
@@ -117,7 +117,7 @@ protected Session decorate(Session session) {
         if (session == null) {
             throw new IllegalArgumentException("session cannot be null");
         }
-        return new StoppingAwareProxiedSession(session, this);
+        return session instanceof StoppingAwareProxiedSession ? session : new StoppingAwareProxiedSession(session, this);
     }
 
     public SecurityManager getSecurityManager() {