diff --git a/device-types/Cisco/DPC3939B.yaml b/device-types/Cisco/DPC3939B.yaml
index a32b7f955..396588603 100644
--- a/device-types/Cisco/DPC3939B.yaml
+++ b/device-types/Cisco/DPC3939B.yaml
@@ -2,7 +2,7 @@
 manufacturer: Cisco
 model: DPC3939B
 slug: cisco-dpc3939B
-part_number: DPC3939B
+part_number: DPC3939B-AMC11-K9
 u_height: 0
 is_full_depth: false
 comments: Comcast Business Gateway Model DPC3939B