diff --git a/jetty-websocket/websocket-api/src/main/java/org/eclipse/jetty/websocket/api/UpgradeRequest.java b/jetty-websocket/websocket-api/src/main/java/org/eclipse/jetty/websocket/api/UpgradeRequest.java
index 7b88670b40d..8729131d34e 100644
--- a/jetty-websocket/websocket-api/src/main/java/org/eclipse/jetty/websocket/api/UpgradeRequest.java
+++ b/jetty-websocket/websocket-api/src/main/java/org/eclipse/jetty/websocket/api/UpgradeRequest.java
@@ -198,16 +198,6 @@ public class UpgradeRequest
         return version;
     }
 
-    public String getProtocolVersion()
-    {
-        String version = getHeader("Sec-WebSocket-Version");
-        if (version == null)
-        {
-            return "13";
-        }
-        return version;
-    }
-
     public String getQueryString()
     {
         return requestURI.getQuery();