diff --git a/includes/definitions/vyatta.yaml b/includes/definitions/vyatta.yaml
index 01e166e9fd..99cdbef64c 100644
--- a/includes/definitions/vyatta.yaml
+++ b/includes/definitions/vyatta.yaml
@@ -7,5 +7,8 @@ over:
     - { graph: device_processor, text: 'Processor Usage' }
     - { graph: device_ucd_memory, text: 'Memory Usage' }
 discovery:
-    - sysDescr_regex:
-        - '/^Vyatta((?!VyOS).)*$/' # = starts_with($sysDescr, 'Vyatta') && !str_contains($sysDescr, 'VyOS')
+    -
+      sysDescr_regex:
+        - '/^Vyatta/'
+      sysDescr_except:
+        - 'VyOS'