diff --git a/jetty-util/src/main/java/org/eclipse/jetty/util/TypeUtil.java b/jetty-util/src/main/java/org/eclipse/jetty/util/TypeUtil.java
index 2fccddc570ae..6ca9a524251a 100644
--- a/jetty-util/src/main/java/org/eclipse/jetty/util/TypeUtil.java
+++ b/jetty-util/src/main/java/org/eclipse/jetty/util/TypeUtil.java
@@ -752,6 +752,7 @@ public static boolean isUnboxable(Class<?> type, Object arg)
             return true;
 
         Class<?> c = __unbox.get(type);
-        return arg.getClass() == __unbox.get(type);
+        Class<?> ac = arg.getClass();
+        return ac == __unbox.get(type) || (Number.class.isAssignableFrom(c) && Number.class.isAssignableFrom(ac));
     }
 }