diff --git a/src/FSharp.Data.GraphQL.Server.AspNetCore/GraphQLOptions.fs b/src/FSharp.Data.GraphQL.Server.AspNetCore/GraphQLOptions.fs
index b1bf15b3..38af8ba3 100644
--- a/src/FSharp.Data.GraphQL.Server.AspNetCore/GraphQLOptions.fs
+++ b/src/FSharp.Data.GraphQL.Server.AspNetCore/GraphQLOptions.fs
@@ -13,7 +13,7 @@ module GraphQLOptionsDefaults =
 
     let [<Literal>] ReadBufferSize = 4096
     let [<Literal>] WebSocketEndpoint = "/ws"
-    let [<Literal>] WebSocketConnectionInitTimeoutInMs = 3000
+    let [<Literal>] WebSocketConnectionInitTimeoutInMs = 3000.0
 
 module GraphQLOptions =