diff --git a/src/IdentityServer4/src/Services/Default/DefaultTokenService.cs b/src/IdentityServer4/src/Services/Default/DefaultTokenService.cs
index 1042951efe..0085e5d8b7 100644
--- a/src/IdentityServer4/src/Services/Default/DefaultTokenService.cs
+++ b/src/IdentityServer4/src/Services/Default/DefaultTokenService.cs
@@ -197,6 +197,11 @@ public virtual async Task<Token> CreateAccessTokenAsync(TokenCreationRequest req
                 claims.Add(new Claim(JwtClaimTypes.JwtId, CryptoRandom.CreateUniqueId(16)));
             }
 
+            if (request.ValidatedRequest.SessionId.IsPresent())
+            {
+                claims.Add(new Claim(JwtClaimTypes.SessionId, request.ValidatedRequest.SessionId));
+            }
+
             var issuer = ContextAccessor.HttpContext.GetIdentityServerIssuerUri();
             var token = new Token(OidcConstants.TokenTypes.AccessToken)
             {
@@ -236,7 +241,7 @@ public virtual async Task<Token> CreateAccessTokenAsync(TokenCreationRequest req
                     }
                 }
             }
-
+            
             return token;
         }
 
diff --git a/src/IdentityServer4/test/IdentityServer.UnitTests/Services/Default/DefaultTokenServiceTests.cs b/src/IdentityServer4/test/IdentityServer.UnitTests/Services/Default/DefaultTokenServiceTests.cs
index 9c69121e37..e95c12301e 100644
--- a/src/IdentityServer4/test/IdentityServer.UnitTests/Services/Default/DefaultTokenServiceTests.cs
+++ b/src/IdentityServer4/test/IdentityServer.UnitTests/Services/Default/DefaultTokenServiceTests.cs
@@ -5,6 +5,7 @@
 using System.Linq;
 using System.Threading.Tasks;
 using FluentAssertions;
+using IdentityModel;
 using IdentityServer.UnitTests.Common;
 using IdentityServer4.Configuration;
 using IdentityServer4.Models;
@@ -114,5 +115,41 @@ public async Task CreateAccessTokenAsync_when_no_apiresources_should_not_include
 
             result.Audiences.Count.Should().Be(0);
         }
+
+
+        [Fact]
+        public async Task CreateAccessTokenAsync_when_no_session_should_not_include_sid()
+        {
+            var request = new TokenCreationRequest
+            {
+                ValidatedResources = new ResourceValidationResult(),
+                ValidatedRequest = new ValidatedRequest()
+                {
+                    Client = new Client { },
+                    SessionId = null
+                }
+            };
+
+            var result = await _subject.CreateAccessTokenAsync(request);
+
+            result.Claims.SingleOrDefault(x => x.Type == JwtClaimTypes.SessionId).Should().BeNull();
+        }
+        [Fact]
+        public async Task CreateAccessTokenAsync_when_session_should_include_sid()
+        {
+            var request = new TokenCreationRequest
+            {
+                ValidatedResources = new ResourceValidationResult(),
+                ValidatedRequest = new ValidatedRequest()
+                {
+                    Client = new Client { },
+                    SessionId = "123"
+                }
+            };
+
+            var result = await _subject.CreateAccessTokenAsync(request);
+
+            result.Claims.SingleOrDefault(x => x.Type == JwtClaimTypes.SessionId).Value.Should().Be("123");
+        }
     }
 }