diff --git a/src/Microsoft.AspNetCore.SystemWebAdapters/Adapters/IBrowserCapabilitiesFactory.cs b/src/Microsoft.AspNetCore.SystemWebAdapters/Adapters/IBrowserCapabilitiesFactory.cs
index 1453d2a387..bd9b9536a3 100644
--- a/src/Microsoft.AspNetCore.SystemWebAdapters/Adapters/IBrowserCapabilitiesFactory.cs
+++ b/src/Microsoft.AspNetCore.SystemWebAdapters/Adapters/IBrowserCapabilitiesFactory.cs
@@ -4,7 +4,7 @@
 namespace Microsoft.AspNetCore.SystemWebAdapters;
 
 #if NET6_0_OR_GREATER
-public interface IBrowserCapabilitiesFactory
+internal interface IBrowserCapabilitiesFactory
 {
     IHttpBrowserCapabilityFeature Create(HttpRequestCore request);
 }
diff --git a/src/Microsoft.AspNetCore.SystemWebAdapters/Adapters/IHttpBrowserCapabilityFeature.cs b/src/Microsoft.AspNetCore.SystemWebAdapters/Adapters/IHttpBrowserCapabilityFeature.cs
index af23530907..ae3d94c0f8 100644
--- a/src/Microsoft.AspNetCore.SystemWebAdapters/Adapters/IHttpBrowserCapabilityFeature.cs
+++ b/src/Microsoft.AspNetCore.SystemWebAdapters/Adapters/IHttpBrowserCapabilityFeature.cs
@@ -4,7 +4,7 @@
 namespace Microsoft.AspNetCore.SystemWebAdapters;
 
 #if NET6_0_OR_GREATER
-public interface IHttpBrowserCapabilityFeature
+internal interface IHttpBrowserCapabilityFeature
 {
     string? this[string key] { get; }
 }