diff --git a/openstack_dashboard/dashboards/project/static/dashboard/project/workflow/launch-instance/configuration/configuration.controller.js b/openstack_dashboard/dashboards/project/static/dashboard/project/workflow/launch-instance/configuration/configuration.controller.js
index 3a13c03307..1ea73264f2 100644
--- a/openstack_dashboard/dashboards/project/static/dashboard/project/workflow/launch-instance/configuration/configuration.controller.js
+++ b/openstack_dashboard/dashboards/project/static/dashboard/project/workflow/launch-instance/configuration/configuration.controller.js
@@ -14,7 +14,8 @@
 (function () {
   'use strict';
 
-  var MAX_SCRIPT_SIZE = 16 * 1024;
+  /* 64kB, adjusted for Base64 encoding. */
+  var MAX_SCRIPT_SIZE = 64 * 1024 * 0.75;
 
   angular
     .module('horizon.dashboard.project.workflow.launch-instance')
diff --git a/openstack_dashboard/dashboards/project/static/dashboard/project/workflow/launch-instance/configuration/configuration.controller.spec.js b/openstack_dashboard/dashboards/project/static/dashboard/project/workflow/launch-instance/configuration/configuration.controller.spec.js
index b6b45c304d..9177f380a9 100644
--- a/openstack_dashboard/dashboards/project/static/dashboard/project/workflow/launch-instance/configuration/configuration.controller.spec.js
+++ b/openstack_dashboard/dashboards/project/static/dashboard/project/workflow/launch-instance/configuration/configuration.controller.spec.js
@@ -38,7 +38,7 @@
       });
 
       it('sets the user data max script size', function() {
-        expect(ctrl.MAX_SCRIPT_SIZE).toBe(16 * 1024);
+        expect(ctrl.MAX_SCRIPT_SIZE).toBe(64 * 1024 * 0.75);
       });
 
     });