diff --git a/device-types/Cisco/WS-C3750-48TS-S.yaml b/device-types/Cisco/WS-C3750-48TS-S.yaml
index c84efc6d3..781646445 100644
--- a/device-types/Cisco/WS-C3750-48TS-S.yaml
+++ b/device-types/Cisco/WS-C3750-48TS-S.yaml
@@ -110,6 +110,10 @@ interfaces:
     type: 1000base-x-sfp
   - name: GigabitEthernet1/0/4
     type: 1000base-x-sfp
+  - name: Stack 1
+    type: cisco-stackwise
+  - name: Stack 2
+    type: cisco-stackwise
 power-ports:
   - name: PSU0
     type: iec-60320-c14