diff --git a/nimble/transport/ram/syscfg.yml b/nimble/transport/ram/syscfg.yml
index 60060771a..0323ace6c 100644
--- a/nimble/transport/ram/syscfg.yml
+++ b/nimble/transport/ram/syscfg.yml
@@ -40,6 +40,3 @@ syscfg.defs:
             This is the maximum size of the data portion of HCI ACL data
             packets. It does not include the HCI data header (of 4 bytes).
         value: 255
-
-syscfg.vals.BLE_EXT_ADV:
-    BLE_HCI_EVT_BUF_SIZE: 274
diff --git a/nimble/transport/socket/syscfg.yml b/nimble/transport/socket/syscfg.yml
index bbb35f383..530850064 100644
--- a/nimble/transport/socket/syscfg.yml
+++ b/nimble/transport/socket/syscfg.yml
@@ -71,6 +71,3 @@ syscfg.defs:
     BLE_SOCK_STACK_SIZE:
         description: 'Size of the HCI socket stack (units=words).'
         value: 80
-
-syscfg.vals.BLE_EXT_ADV:
-    BLE_HCI_EVT_BUF_SIZE: 274
diff --git a/nimble/transport/uart/syscfg.yml b/nimble/transport/uart/syscfg.yml
index 0ffa1da35..81b47f373 100644
--- a/nimble/transport/uart/syscfg.yml
+++ b/nimble/transport/uart/syscfg.yml
@@ -66,6 +66,3 @@ syscfg.defs:
     BLE_HCI_UART_FLOW_CTRL:
         description: 'Flow control used for HCI uart interface'
         value:       HAL_UART_FLOW_CTL_RTS_CTS
-
-syscfg.vals.BLE_EXT_ADV:
-    BLE_HCI_EVT_BUF_SIZE: 274