diff --git a/jetty-servlets/src/main/java/org/eclipse/jetty/servlets/QoSFilter.java b/jetty-servlets/src/main/java/org/eclipse/jetty/servlets/QoSFilter.java
index 66de1572c640..598943c8ff0a 100644
--- a/jetty-servlets/src/main/java/org/eclipse/jetty/servlets/QoSFilter.java
+++ b/jetty-servlets/src/main/java/org/eclipse/jetty/servlets/QoSFilter.java
@@ -235,7 +235,8 @@ public void doFilter(ServletRequest request, ServletResponse response, FilterCha
                             }
                             catch (IllegalStateException x)
                             {
-                                LOG.warn(x);
+                                if (LOG.isDebugEnabled())
+                                    LOG.debug(x);
                                 continue;
                             }
                         }