diff --git a/lib/services/monitorManagement/lib/models/actionGroupResource.js b/lib/services/monitorManagement/lib/models/actionGroupResource.js
index 9a443885a8..f69df88ef8 100644
--- a/lib/services/monitorManagement/lib/models/actionGroupResource.js
+++ b/lib/services/monitorManagement/lib/models/actionGroupResource.js
@@ -111,7 +111,7 @@ class ActionGroupResource extends models['Resource'] {
             required: true,
             serializedName: 'properties.groupShortName',
             constraints: {
-              MaxLength: 15
+              MaxLength: 12
             },
             type: {
               name: 'String'