diff --git a/config/nrfconnect/app/overlay-dfu_support.conf b/config/nrfconnect/app/overlay-dfu_support.conf
index 0760bd8717626c..c09ef695ee0ae3 100644
--- a/config/nrfconnect/app/overlay-dfu_support.conf
+++ b/config/nrfconnect/app/overlay-dfu_support.conf
@@ -36,6 +36,5 @@ CONFIG_MCUMGR_SMP_BT_AUTHEN=n
 CONFIG_MCUMGR_BUF_COUNT=6
 
 # Increase BT MTU and RX buffer for big size DFU messages
-CONFIG_BT_L2CAP_TX_MTU=252
-CONFIG_BT_L2CAP_RX_MTU=252
-CONFIG_BT_RX_BUF_LEN=260
+CONFIG_BT_L2CAP_TX_MTU=260
+CONFIG_BT_BUF_ACL_RX_SIZE=264