diff --git a/sdk/core/Azure.Core/src/Pipeline/HttpHeader.cs b/sdk/core/Azure.Core/src/Pipeline/HttpHeader.cs
index 52a5dc189ee90..ee01cfe537286 100644
--- a/sdk/core/Azure.Core/src/Pipeline/HttpHeader.cs
+++ b/sdk/core/Azure.Core/src/Pipeline/HttpHeader.cs
@@ -62,10 +62,12 @@ public static class Common
         {
             static readonly string s_applicationJson = "application/json";
             static readonly string s_applicationOctetStream = "application/octet-stream";
+            static readonly string s_applicationFormUrlEncoded = "application/x-www-form-urlencoded";
 
             public static readonly HttpHeader JsonContentType = new HttpHeader(Names.ContentType, s_applicationJson);
             public static readonly HttpHeader JsonAccept = new HttpHeader(Names.Accept, s_applicationJson);
             public static readonly HttpHeader OctetStreamContentType = new HttpHeader(Names.ContentType, s_applicationOctetStream);
+            public static readonly HttpHeader FormUrlEncodedContentType = new HttpHeader(Names.ContentType, s_applicationFormUrlEncoded);
         }
     }
 }
diff --git a/sdk/identity/Azure.Identity/src/IdentityClient.cs b/sdk/identity/Azure.Identity/src/IdentityClient.cs
index c61aef85f238f..53bfee83ebecf 100644
--- a/sdk/identity/Azure.Identity/src/IdentityClient.cs
+++ b/sdk/identity/Azure.Identity/src/IdentityClient.cs
@@ -8,6 +8,7 @@
 using System.Buffers;
 using System.Collections.Generic;
 using System.IO;
+using System.Net.Http;
 using System.Runtime.CompilerServices;
 using System.Security.Cryptography;
 using System.Security.Cryptography.X509Certificates;
@@ -171,7 +172,7 @@ private Request CreateClientSecretAuthRequest(string tenantId, string clientId,
 
             request.Method = HttpPipelineMethod.Post;
 
-            request.Headers.SetValue("Content-Type", "application/x-www-form-urlencoded");
+            request.Headers.Add(HttpHeader.Common.FormUrlEncodedContentType);
 
             request.UriBuilder.Uri = _options.AuthorityHost;
 
@@ -194,7 +195,7 @@ private Request CreateClientCertificateAuthRequest(string tenantId, string clien
 
             request.Method = HttpPipelineMethod.Post;
 
-            request.Headers.SetValue("Content-Type", "application/x-www-form-urlencoded");
+            request.Headers.Add(HttpHeader.Common.FormUrlEncodedContentType);
 
             request.UriBuilder.Uri = _options.AuthorityHost;