diff --git a/spring-core/src/main/java/org/springframework/cglib/core/SpringNamingPolicy.java b/spring-core/src/main/java/org/springframework/cglib/core/SpringNamingPolicy.java
index 7063cc86da..ed91f3a2d9 100644
--- a/spring-core/src/main/java/org/springframework/cglib/core/SpringNamingPolicy.java
+++ b/spring-core/src/main/java/org/springframework/cglib/core/SpringNamingPolicy.java
@@ -40,7 +40,7 @@ public final class SpringNamingPolicy implements NamingPolicy {
 		if (prefix == null) {
 			prefix = "org.springframework.cglib.empty.Object";
 		}
-		else if (prefix.startsWith("java")) {
+		else if (prefix.startsWith("java.") || prefix.startsWith("javax.")) {
 			prefix = "_" + prefix;
 		}