diff --git a/src/Microsoft.AspNetCore.SignalR.Core/HubOptionsSetup.cs b/src/Microsoft.AspNetCore.SignalR.Core/HubOptionsSetup.cs
index e3ee99cf32..d2123ac883 100644
--- a/src/Microsoft.AspNetCore.SignalR.Core/HubOptionsSetup.cs
+++ b/src/Microsoft.AspNetCore.SignalR.Core/HubOptionsSetup.cs
@@ -10,7 +10,7 @@ namespace Microsoft.AspNetCore.SignalR
 {
     public class HubOptionsSetup : IConfigureOptions<HubOptions>
     {
-        internal static TimeSpan DefaultHandshakeTimeout => TimeSpan.FromSeconds(5);
+        internal static TimeSpan DefaultHandshakeTimeout => TimeSpan.FromSeconds(15);
 
         internal static TimeSpan DefaultKeepAliveInterval => TimeSpan.FromSeconds(15);