diff --git a/api/src/main/scala/za/co/absa/loginsvc/rest/SecurityConfig.scala b/api/src/main/scala/za/co/absa/loginsvc/rest/SecurityConfig.scala
index cdd747e..ead04ed 100644
--- a/api/src/main/scala/za/co/absa/loginsvc/rest/SecurityConfig.scala
+++ b/api/src/main/scala/za/co/absa/loginsvc/rest/SecurityConfig.scala
@@ -93,6 +93,8 @@ class SecurityConfig @Autowired()(authConfigsProvider: AuthConfigProvider, authM
 
         case _ =>
           response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
+          response.setContentType("application/json");
+          response.getWriter.write(s"""{"error": "User login error"}""");
       }
     }