diff --git a/src/Private/ServiceName.cs b/src/Private/ServiceName.cs
index 1974da04..9d104163 100644
--- a/src/Private/ServiceName.cs
+++ b/src/Private/ServiceName.cs
@@ -4,5 +4,6 @@ internal static class ServiceName
     {
         internal const string OpenSearchServerless = "aoss";
         internal const string S3 = "s3";
+        internal const string VpcLatticeService = "vpc-lattice-svcs";
     }
 }
diff --git a/src/Private/Signer.cs b/src/Private/Signer.cs
index 405d0e50..9c78cc9f 100644
--- a/src/Private/Signer.cs
+++ b/src/Private/Signer.cs
@@ -23,7 +23,9 @@ public static async Task<Result> SignAsync(
 
             UpdateRequestUri(request, baseAddress);
 
-            var contentHash = await ContentHash.CalculateAsync(request.Content).ConfigureAwait(false);
+            var contentHash = serviceName == ServiceName.VpcLatticeService ?
+                "UNSIGNED-PAYLOAD" :
+                await ContentHash.CalculateAsync(request.Content).ConfigureAwait(false);
 
             AddHeaders(request, now, serviceName, credentials, contentHash);
 
@@ -136,6 +138,7 @@ private static void AddHeaders(
             request.AddHeaderIf(credentials.UseToken, HeaderKeys.XAmzSecurityTokenHeader, credentials.Token);
             request.AddHeaderIf(!request.Headers.Contains(HeaderKeys.HostHeader), HeaderKeys.HostHeader, request.RequestUri!.Host);
             request.AddHeaderIf(serviceName == ServiceName.OpenSearchServerless, HeaderKeys.XAmzContentSha256Header, contentHash);
+            request.AddHeaderIf(serviceName == ServiceName.VpcLatticeService, HeaderKeys.XAmzContentSha256Header, contentHash);
             request.AddHeaderIf(serviceName == ServiceName.S3, HeaderKeys.XAmzContentSha256Header, contentHash);
         }