diff --git a/spring-orm/src/main/java/org/springframework/orm/hibernate3/support/OpenSessionInViewFilter.java b/spring-orm/src/main/java/org/springframework/orm/hibernate3/support/OpenSessionInViewFilter.java
index fbcac64f644e..30cdc55f53b0 100644
--- a/spring-orm/src/main/java/org/springframework/orm/hibernate3/support/OpenSessionInViewFilter.java
+++ b/spring-orm/src/main/java/org/springframework/orm/hibernate3/support/OpenSessionInViewFilter.java
@@ -218,6 +218,9 @@ protected void doFilterInternal(
 					closeSession(sessionHolder.getSession(), sessionFactory);
 				}
 				else {
+					if (chain.isAsyncStarted()) {
+						throw new IllegalStateException("Deferred close is not supported with async requests.");
+					}
 					// deferred close mode
 					SessionFactoryUtils.processDeferredClose(sessionFactory);
 				}
diff --git a/spring-orm/src/main/java/org/springframework/orm/hibernate3/support/OpenSessionInViewInterceptor.java b/spring-orm/src/main/java/org/springframework/orm/hibernate3/support/OpenSessionInViewInterceptor.java
index 7fdd1518955b..5eccff677beb 100644
--- a/spring-orm/src/main/java/org/springframework/orm/hibernate3/support/OpenSessionInViewInterceptor.java
+++ b/spring-orm/src/main/java/org/springframework/orm/hibernate3/support/OpenSessionInViewInterceptor.java
@@ -193,8 +193,13 @@ public Object call() throws Exception {
 	 */
 	public void postHandleAsyncStarted(WebRequest request) {
 		String attributeName = getParticipateAttributeName();
-		if ((request.getAttribute(attributeName, WebRequest.SCOPE_REQUEST) == null) && isSingleSession()) {
-			TransactionSynchronizationManager.unbindResource(getSessionFactory());
+		if (request.getAttribute(attributeName, WebRequest.SCOPE_REQUEST) == null) {
+			if (isSingleSession()) {
+				TransactionSynchronizationManager.unbindResource(getSessionFactory());
+			}
+			else {
+				throw new IllegalStateException("Deferred close is not supported with async requests.");
+			}
 		}
 	}