diff --git a/org.springframework.aop/src/main/java/org/springframework/aop/framework/AopProxyUtils.java b/org.springframework.aop/src/main/java/org/springframework/aop/framework/AopProxyUtils.java
index af9e277b5231..9f203a69be4a 100644
--- a/org.springframework.aop/src/main/java/org/springframework/aop/framework/AopProxyUtils.java
+++ b/org.springframework.aop/src/main/java/org/springframework/aop/framework/AopProxyUtils.java
@@ -86,10 +86,11 @@ public static Class[] completeProxiedInterfaces(AdvisedSupport advised) {
 		Class[] specifiedInterfaces = advised.getProxiedInterfaces();
 		if (specifiedInterfaces.length == 0) {
 			// No user-specified interfaces: check whether target class is an interface.
-			Class<?> targetClass = advised.getTargetClass();
+			Class targetClass = advised.getTargetClass();
 			if (targetClass != null) {
 				if (targetClass.isInterface()) {
-					advised.setInterfaces(targetClass);
+					specifiedInterfaces = new Class[] {targetClass};
+					advised.setInterfaces(specifiedInterfaces);
 				}
 				else if (Proxy.isProxyClass(targetClass)) {
 					advised.setInterfaces(targetClass.getInterfaces());