diff --git a/src/TypedSignalR.Client.DevTools.Specification/Templates/CoreTemplate.cs b/src/TypedSignalR.Client.DevTools.Specification/Templates/CoreTemplate.cs
index 045b457..f6a64b1 100644
--- a/src/TypedSignalR.Client.DevTools.Specification/Templates/CoreTemplate.cs
+++ b/src/TypedSignalR.Client.DevTools.Specification/Templates/CoreTemplate.cs
@@ -16,7 +16,7 @@ public string TransformText()
 
 namespace TypedSignalR.Client.DevTools;
 
-public static partial class EndpointRouteBuilderExtensions
+internal static partial class EndpointRouteBuilderExtensions
 {
     /// <summary>
     /// /signalr-dev/spec.json
diff --git a/src/TypedSignalR.Client.DevTools.Specification/Templates/SpecificationTemplate.cs b/src/TypedSignalR.Client.DevTools.Specification/Templates/SpecificationTemplate.cs
index 93745f0..be77edc 100644
--- a/src/TypedSignalR.Client.DevTools.Specification/Templates/SpecificationTemplate.cs
+++ b/src/TypedSignalR.Client.DevTools.Specification/Templates/SpecificationTemplate.cs
@@ -47,7 +47,7 @@ public string TransformText()
 
 namespace TypedSignalR.Client.DevTools;
 
-public static partial class EndpointRouteBuilderExtensions
+internal static partial class EndpointRouteBuilderExtensions
 {{
     private static partial ReadOnlySpan<byte> GetSpecJsonBytes() => new byte[] {{ {str} }};
 }}";