diff --git a/device-types/Cisco/ISR4431.yaml b/device-types/Cisco/ISR4431.yaml
index 483720232..a0da1983a 100644
--- a/device-types/Cisco/ISR4431.yaml
+++ b/device-types/Cisco/ISR4431.yaml
@@ -1,5 +1,6 @@
 manufacturer: Cisco
 model: ISR4431
+part_number: ISR4431/K9
 slug: isr4431
 u_height: 1
 is_full_depth: true