diff --git a/src/libraries/System.Net.Http/ref/System.Net.Http.cs b/src/libraries/System.Net.Http/ref/System.Net.Http.cs
index 131f048c0d847..9fd1f1905dde9 100644
--- a/src/libraries/System.Net.Http/ref/System.Net.Http.cs
+++ b/src/libraries/System.Net.Http/ref/System.Net.Http.cs
@@ -268,7 +268,7 @@ public SocketsHttpHandler() { }
         public bool AllowAutoRedirect { get { throw null; } set { } }
         public System.Net.DecompressionMethods AutomaticDecompression { get { throw null; } set { } }
         public System.TimeSpan ConnectTimeout { get { throw null; } set { } }
-        [System.Diagnostics.CodeAnalysis.AllowNull]
+        [System.Diagnostics.CodeAnalysis.AllowNullAttribute]
         public System.Net.CookieContainer CookieContainer { get { throw null; } set { } }
         public System.Net.ICredentials? Credentials { get { throw null; } set { } }
         public System.Net.ICredentials? DefaultProxyCredentials { get { throw null; } set { } }
@@ -347,7 +347,7 @@ public CacheControlHeaderValue() { }
         public static System.Net.Http.Headers.CacheControlHeaderValue Parse(string? input) { throw null; }
         object System.ICloneable.Clone() { throw null; }
         public override string ToString() { throw null; }
-        public static bool TryParse(string? input, [System.Diagnostics.CodeAnalysis.NotNullWhenAttribute(true)] out System.Net.Http.Headers.CacheControlHeaderValue? parsedValue) { throw null; }
+        public static bool TryParse(string? input, out System.Net.Http.Headers.CacheControlHeaderValue? parsedValue) { throw null; }
     }
     public partial class ContentDispositionHeaderValue : System.ICloneable
     {
@@ -569,7 +569,7 @@ public ProductHeaderValue(string name, string? version) { }
         public static System.Net.Http.Headers.ProductHeaderValue Parse(string? input) { throw null; }
         object System.ICloneable.Clone() { throw null; }
         public override string ToString() { throw null; }
-        public static bool TryParse(string? input, out System.Net.Http.Headers.ProductHeaderValue? parsedValue) { throw null; }
+        public static bool TryParse(string? input, [System.Diagnostics.CodeAnalysis.NotNullWhenAttribute(true)] out System.Net.Http.Headers.ProductHeaderValue? parsedValue) { throw null; }
     }
     public partial class ProductInfoHeaderValue : System.ICloneable
     {