diff --git a/test/src/main/java/org/jvnet/hudson/test/MockBuilder.java b/test/src/main/java/org/jvnet/hudson/test/MockBuilder.java
index 771cbe762171982b46bb2dbe0fd36886300f5dbe..fad81e9d5cbc49b06bb257b6416ad510ceee9833 100644
--- a/test/src/main/java/org/jvnet/hudson/test/MockBuilder.java
+++ b/test/src/main/java/org/jvnet/hudson/test/MockBuilder.java
@@ -30,6 +30,11 @@ public class MockBuilder extends Builder {
         build.setResult(result);
         return true;
     }
+    
+    @Override
+    public Descriptor<Builder> getDescriptor() {
+        return new DescriptorImpl();
+    }
 
     @Extension
     public static final class DescriptorImpl extends Descriptor<Builder> {