diff --git a/lib/transport.js b/lib/transport.js
index f69ce3db9..1d178cd42 100644
--- a/lib/transport.js
+++ b/lib/transport.js
@@ -227,7 +227,7 @@
 			+ ':' + this.base.options.port
 			+ '/' + this.base.options.resource
 			+ '/' + this.type
-			+ (this.sessionid ? ('/' + this.sessionid) : '/');
+			+ '/' + (this.sessionid ? this.sessionid : 'null');
 	};
 
 })();
\ No newline at end of file
diff --git a/lib/transports/websocket.js b/lib/transports/websocket.js
index b3c3d1fc3..f543ec94f 100644
--- a/lib/transports/websocket.js
+++ b/lib/transports/websocket.js
@@ -88,7 +88,7 @@
 		+ ':' + this.base.options.port
 		+ '/' + this.base.options.resource
 		+ '/' + this.type
-		+ (this.sessionid ? ('/' + this.sessionid) : '');
+		+ '/' + (this.sessionid ? this.sessionid : 'null');
 	};
 	
 	WS.check = function(){
diff --git a/socket.io.js b/socket.io.js
index 328a7d355..c3eecb3bb 100644
--- a/socket.io.js
+++ b/socket.io.js
@@ -313,7 +313,7 @@ if (typeof window != 'undefined'){
 			+ ':' + this.base.options.port
 			+ '/' + this.base.options.resource
 			+ '/' + this.type
-			+ (this.sessionid ? ('/' + this.sessionid) : '/');
+			+ '/' + (this.sessionid ? this.sessionid : 'null');
 	};
 
 })();
@@ -548,7 +548,7 @@ if (typeof window != 'undefined'){
 		+ ':' + this.base.options.port
 		+ '/' + this.base.options.resource
 		+ '/' + this.type
-		+ (this.sessionid ? ('/' + this.sessionid) : '');
+		+ '/' + (this.sessionid ? this.sessionid : 'null');
 	};
 	
 	WS.check = function(){