diff --git a/Duplicati/UnitTest/ServerApiIntegrationTests.cs b/Duplicati/UnitTest/ServerApiIntegrationTests.cs
index 3d7799e69..17070cb20 100644
--- a/Duplicati/UnitTest/ServerApiIntegrationTests.cs
+++ b/Duplicati/UnitTest/ServerApiIntegrationTests.cs
@@ -408,7 +408,7 @@ public class ServerApiIntegrationTests : BasicSetupHelper
     {
         var restoreResponse = await httpClient.PostAsJsonAsync(
             $"/api/v1/backup/{backupId}/restore",
-            new RestoreInputDto(null, passphrase, "now", restoreFolder, true, false, false, null),
+            new RestoreInputDto(null, passphrase, "now", restoreFolder, true, false, false, null, null),
             JsonOptions).ConfigureAwait(false);
         restoreResponse.EnsureSuccessStatusCode();
         var task = await restoreResponse.Content.ReadFromJsonAsync<TaskStartedDto>(JsonOptions).ConfigureAwait(false)
diff --git a/Duplicati/WebserverCore/Dto/RestoreInputDto.cs b/Duplicati/WebserverCore/Dto/RestoreInputDto.cs
index e7f3ada56..7e1e7c65b 100644
--- a/Duplicati/WebserverCore/Dto/RestoreInputDto.cs
+++ b/Duplicati/WebserverCore/Dto/RestoreInputDto.cs
@@ -30,6 +30,7 @@ namespace Duplicati.WebserverCore.Dto;
 /// <param name="overwrite">Whether to overwrite existing files</param>
 /// <param name="permissions">Whether to restore permissions</param>
 /// <param name="skip_metadata">Whether to skip metadata</param>
+/// <param name="connection_string_id">The connection string ID to use, if the destination is a masked remote source</param>
 /// <param name="source_prefix">The source prefix to use, if the destination is a masked remote source</param>
 public sealed record RestoreInputDto(
     string[]? paths,
@@ -39,4 +40,5 @@ public sealed record RestoreInputDto(
     bool? overwrite,
     bool? permissions,
     bool? skip_metadata,
+    long? connection_string_id,
     string? source_prefix);
diff --git a/Duplicati/WebserverCore/Endpoints/V1/Backup/BackupPost.cs b/Duplicati/WebserverCore/Endpoints/V1/Backup/BackupPost.cs
index 42c9263f4..3a600ce0a 100644
--- a/Duplicati/WebserverCore/Endpoints/V1/Backup/BackupPost.cs
+++ b/Duplicati/WebserverCore/Endpoints/V1/Backup/BackupPost.cs
@@ -120,7 +120,7 @@ public class BackupPost : IEndpointV1
         var restorepath = input.restore_path;
         if (restorepath != null && restorepath.StartsWith("@"))
         {
-            var res = await SharedRemoteOperation.ExpandUrl(connection, applicationSettings, restorepath.Substring(1), id, input.source_prefix, cancellationToken);
+            var res = await SharedRemoteOperation.ExpandUrl(connection, applicationSettings, restorepath.Substring(1), id, input.connection_string_id ?? -1, input.source_prefix, cancellationToken);
             if (!string.IsNullOrWhiteSpace(res.Url))
                 restorepath = "@" + res.Url;
         }