diff --git a/test/src/main/java/org/jvnet/hudson/test/HudsonTestCase.java b/test/src/main/java/org/jvnet/hudson/test/HudsonTestCase.java
index 0d83bca01e61016f91ced78edb59bc19e32d8be6..fafc3dba6dbac70ac4c794c9de513843a906fa07 100644
--- a/test/src/main/java/org/jvnet/hudson/test/HudsonTestCase.java
+++ b/test/src/main/java/org/jvnet/hudson/test/HudsonTestCase.java
@@ -442,6 +442,7 @@ public abstract class HudsonTestCase extends TestCase implements RootAction {
         context.setMimeTypes(MIME_TYPES);
 
         SocketConnector connector = new SocketConnector();
+        connector.setHeaderBufferSize(12*1024); // use a bigger buffer as Stapler traces can get pretty large on deeply nested URL
 
         server.setThreadPool(new ThreadPoolImpl(new ThreadPoolExecutor(10, 10, 10L, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>(),new ThreadFactory() {
             public Thread newThread(Runnable r) {