diff --git a/subsys/bluetooth/common/Kconfig b/subsys/bluetooth/common/Kconfig
index 3e9f63a4bb9..aaa9362ebe3 100644
--- a/subsys/bluetooth/common/Kconfig
+++ b/subsys/bluetooth/common/Kconfig
@@ -109,7 +109,7 @@ config BT_BUF_ACL_RX_COUNT
 
 config BT_BUF_EVT_RX_SIZE
 	int "Maximum supported HCI Event buffer length"
-	default 255 if (BT_EXT_ADV && !(BT_BUF_EVT_DISCARDABLE_COUNT > 0)) || BT_PER_ADV_SYNC || BT_DF_CONNECTION_CTE_RX
+	default 255 if (BT_EXT_ADV && BT_OBSERVER) || BT_PER_ADV_SYNC || BT_DF_CONNECTION_CTE_RX
 	# LE Read Supported Commands command complete event.
 	default 68
 	range 68 255
@@ -136,7 +136,7 @@ config BT_BUF_EVT_DISCARDABLE_SIZE
 	int "Maximum supported discardable HCI Event buffer length"
 	range 43 255
 	# LE Extended Advertising Report event
-	default 255 if BT_BREDR || BT_EXT_ADV
+	default 255 if BT_BREDR
 	# Le Advertising Report event
 	default 43
 	help