diff --git a/src/Microsoft.AspNetCore.Http/Internal/ApplicationBuilder.cs b/src/Microsoft.AspNetCore.Http/Internal/ApplicationBuilder.cs
index c4e6fd7f07..86b098aacd 100644
--- a/src/Microsoft.AspNetCore.Http/Internal/ApplicationBuilder.cs
+++ b/src/Microsoft.AspNetCore.Http/Internal/ApplicationBuilder.cs
@@ -17,7 +17,7 @@ namespace Microsoft.AspNetCore.Builder.Internal
 
         public ApplicationBuilder(IServiceProvider serviceProvider)
         {
-            Properties = new Dictionary<string, object>();
+            Properties = new Dictionary<string, object>(StringComparer.Ordinal);
             ApplicationServices = serviceProvider;
         }
 
@@ -29,7 +29,7 @@ namespace Microsoft.AspNetCore.Builder.Internal
 
         private ApplicationBuilder(ApplicationBuilder builder)
         {
-            Properties = new CopyOnWriteDictionary<string, object>(builder.Properties, EqualityComparer<string>.Default);
+            Properties = new CopyOnWriteDictionary<string, object>(builder.Properties, StringComparer.Ordinal);
         }
 
         public IServiceProvider ApplicationServices