diff --git a/src/Microsoft.IdentityModel.JsonWebTokens/Json/JsonClaimSet.cs b/src/Microsoft.IdentityModel.JsonWebTokens/Json/JsonClaimSet.cs
index 75aa609139..a47e488129 100644
--- a/src/Microsoft.IdentityModel.JsonWebTokens/Json/JsonClaimSet.cs
+++ b/src/Microsoft.IdentityModel.JsonWebTokens/Json/JsonClaimSet.cs
@@ -44,7 +44,7 @@ internal List<Claim> Claims(string issuer)
 
         internal List<Claim> CreateClaims(string issuer)
         {
-            var claims = new List<Claim>();
+            var claims = new List<Claim>(_jsonClaims.Count);
             foreach (KeyValuePair<string, object> kvp in _jsonClaims)
                 CreateClaimFromObject(claims, kvp.Key, kvp.Value, issuer);