diff --git a/websocket-sharp/Net/EndPointListener.cs b/websocket-sharp/Net/EndPointListener.cs
index d7ba2af9..088057f9 100644
--- a/websocket-sharp/Net/EndPointListener.cs
+++ b/websocket-sharp/Net/EndPointListener.cs
@@ -312,7 +312,7 @@ namespace WebSocketSharp.Net
         if (len < bestLen)
           continue;
 
-        if (path.StartsWith (prefPath)) {
+        if (path.StartsWith (prefPath, StringComparison.Ordinal)) {
           bestLen = len;
           ret = pref.Listener;
         }