diff --git a/jetty-util/src/main/java/org/eclipse/jetty/util/UrlEncoded.java b/jetty-util/src/main/java/org/eclipse/jetty/util/UrlEncoded.java
index 4474b6ecd6f..b040de5900b 100644
--- a/jetty-util/src/main/java/org/eclipse/jetty/util/UrlEncoded.java
+++ b/jetty-util/src/main/java/org/eclipse/jetty/util/UrlEncoded.java
@@ -322,6 +322,7 @@ public class UrlEncoded extends MultiMap
                 catch(NotUtf8Exception e)
                 {
                     LOG.warn(e.toString());
+                    LOG.debug(e);
                 }
             }