diff --git a/src/main/java/com/corundumstudio/socketio/handler/AuthorizeHandler.java b/src/main/java/com/corundumstudio/socketio/handler/AuthorizeHandler.java
index b7e396ed..a90a84c5 100644
--- a/src/main/java/com/corundumstudio/socketio/handler/AuthorizeHandler.java
+++ b/src/main/java/com/corundumstudio/socketio/handler/AuthorizeHandler.java
@@ -181,7 +181,7 @@ private boolean authorize(ChannelHandlerContext ctx, Channel channel, String ori
 
         Transport transport = null;
         try {
-            transport = Transport.valueOf(transportValue.get(0));
+            transport = Transport.valueOf(transportValue.get(0).toUpperCase());
         } catch (IllegalArgumentException e) {
             log.error("Unknown transport for request {}", req.uri());
             writeAndFlushTransportError(channel, origin);