diff --git a/source/java/org/alfresco/rest/api/impl/AuthenticationsImpl.java b/source/java/org/alfresco/rest/api/impl/AuthenticationsImpl.java
index dafc57d093..2a6d4dfb0e 100644
--- a/source/java/org/alfresco/rest/api/impl/AuthenticationsImpl.java
+++ b/source/java/org/alfresco/rest/api/impl/AuthenticationsImpl.java
@@ -35,6 +35,7 @@ import org.alfresco.rest.api.People;
 import org.alfresco.rest.api.model.LoginTicket;
 import org.alfresco.rest.api.model.LoginTicketResponse;
 import org.alfresco.rest.framework.core.exceptions.InvalidArgumentException;
+import org.alfresco.rest.framework.core.exceptions.NotFoundException;
 import org.alfresco.rest.framework.core.exceptions.PermissionDeniedException;
 import org.alfresco.rest.framework.resource.parameters.Parameters;
 import org.alfresco.rest.framework.webscripts.WithResponse;
@@ -114,12 +115,12 @@ public class AuthenticationsImpl implements Authentications
             // or the user is not fully authenticated
             if (currentUser == null || !currentUser.equals(ticketUser))
             {
-                withResponse.setStatus(Status.STATUS_NOT_FOUND);
+                throw new NotFoundException(NotFoundException.DEFAULT_MESSAGE_ID, new String[] { ticket });
             }
         }
         catch (AuthenticationException e)
         {
-            withResponse.setStatus(Status.STATUS_NOT_FOUND);
+            throw new NotFoundException(NotFoundException.DEFAULT_MESSAGE_ID, new String[] { ticket });
         }
         LoginTicketResponse response = new LoginTicketResponse();
         response.setId(ticket);
@@ -144,7 +145,7 @@ public class AuthenticationsImpl implements Authentications
             // or the user is not fully authenticated
             if (currentUser == null || !currentUser.equals(ticketUser))
             {
-                withResponse.setStatus(Status.STATUS_NOT_FOUND);
+                throw new NotFoundException(NotFoundException.DEFAULT_MESSAGE_ID, new String[] { ticket });
             }
             else
             {
@@ -154,7 +155,7 @@ public class AuthenticationsImpl implements Authentications
         }
         catch (AuthenticationException e)
         {
-            withResponse.setStatus(Status.STATUS_NOT_FOUND);
+            throw new NotFoundException(NotFoundException.DEFAULT_MESSAGE_ID, new String[] { ticket });
         }
     }
 
diff --git a/source/test-java/org/alfresco/rest/api/tests/AuthenticationsTest.java b/source/test-java/org/alfresco/rest/api/tests/AuthenticationsTest.java
index 040aadeab9..61ce4829d0 100644
--- a/source/test-java/org/alfresco/rest/api/tests/AuthenticationsTest.java
+++ b/source/test-java/org/alfresco/rest/api/tests/AuthenticationsTest.java
@@ -35,6 +35,7 @@ import org.alfresco.rest.api.model.LoginTicket;
 import org.alfresco.rest.api.model.LoginTicketResponse;
 import org.alfresco.rest.api.sites.SiteEntityResource;
 import org.alfresco.rest.api.tests.client.HttpResponse;
+import org.alfresco.rest.api.tests.client.PublicApiClient;
 import org.alfresco.rest.api.tests.client.PublicApiClient.Paging;
 import org.alfresco.rest.api.tests.client.data.Document;
 import org.alfresco.rest.api.tests.client.data.Folder;
@@ -134,7 +135,10 @@ public class AuthenticationsTest extends AbstractSingleNetworkSiteTest
         setRequestContext(user1);
         
         // Check the ticket has been invalidated - the difference with the above is that the API call is authorized
-        getSingle(TICKETS_URL, People.DEFAULT_USER, ticket, null, TICKETS_API_NAME, 404);
+        response = getSingle(TICKETS_URL, People.DEFAULT_USER, ticket, null, TICKETS_API_NAME, 404);
+        PublicApiClient.ExpectedErrorResponse error = RestApiUtil.parseErrorResponse(response.getJsonResponse());
+        // Double check that we've retrieved a standard error response (REPO-1773)
+        assertEquals(404, error.getStatusCode());
 
         // Ticket has already been invalidated
         delete(TICKETS_URL, People.DEFAULT_USER, ticket, null, TICKETS_API_NAME, 404);