diff --git a/jetty-server/src/main/java/org/eclipse/jetty/server/handler/ProxyHandler.java b/jetty-server/src/main/java/org/eclipse/jetty/server/handler/ProxyHandler.java
index 93f4c235815..37cf0c438b9 100644
--- a/jetty-server/src/main/java/org/eclipse/jetty/server/handler/ProxyHandler.java
+++ b/jetty-server/src/main/java/org/eclipse/jetty/server/handler/ProxyHandler.java
@@ -410,9 +410,9 @@ public class ProxyHandler extends AbstractHandler
             {
                 ready.await(timeout, TimeUnit.MILLISECONDS);
             }
-            catch (InterruptedException x)
+            catch (final InterruptedException x)
             {
-                throw new IOException(x);
+                throw new IOException(){{initCause(x);}};
             }
         }