diff --git a/src/main/java/org/jboss/netty/handler/codec/serialization/CompactObjectOutputStream.java b/src/main/java/org/jboss/netty/handler/codec/serialization/CompactObjectOutputStream.java
index 8097dfe355..5de31e1906 100644
--- a/src/main/java/org/jboss/netty/handler/codec/serialization/CompactObjectOutputStream.java
+++ b/src/main/java/org/jboss/netty/handler/codec/serialization/CompactObjectOutputStream.java
@@ -37,7 +37,8 @@ class CompactObjectOutputStream extends ObjectOutputStream {
     @Override
     protected void writeClassDescriptor(ObjectStreamClass desc) throws IOException {
         Class<?> clazz = desc.forClass();
-        if (clazz.isPrimitive() || clazz.isArray() || desc.getSerialVersionUID() == 0) {
+        if (clazz.isPrimitive() || clazz.isArray() || clazz.isInterface() ||
+            desc.getSerialVersionUID() == 0) {
             write(TYPE_FAT_DESCRIPTOR);
             super.writeClassDescriptor(desc);
         } else {