diff --git a/nimble/host/mesh/syscfg.yml b/nimble/host/mesh/syscfg.yml
index c75828d24..73bef03aa 100644
--- a/nimble/host/mesh/syscfg.yml
+++ b/nimble/host/mesh/syscfg.yml
@@ -977,11 +977,10 @@ syscfg.vals.BLE_MESH_GATT_PROXY:
 syscfg.vals.BLE_MESH_PB_GATT:
     BLE_MESH_PROXY: 1
     BLE_MESH_PROV: 1
+    BLE_MESH_PROXY_MSG_LEN: 66
 
 syscfg.vals.BLE_MESH_PB_ADV:
     BLE_MESH_PROV: 1
 
-syscfg.vals.'BLE_MESH_PB_GATT':
-    BLE_MESH_PROXY_MSG_LEN: 66
-syscfg.vals.'BLE_MESH_GATT_PROXY':
+syscfg.vals.'BLE_MESH_GATT_PROXY && !BLE_MESH_PB_GATT':
     BLE_MESH_PROXY_MSG_LEN: 33