diff --git a/tests/bluetooth/tester/nrf5340_hci_ipc.conf b/tests/bluetooth/tester/nrf5340_hci_ipc.conf
index 2b46473ffe5..86603af8f41 100644
--- a/tests/bluetooth/tester/nrf5340_hci_ipc.conf
+++ b/tests/bluetooth/tester/nrf5340_hci_ipc.conf
@@ -5,3 +5,5 @@ CONFIG_BT_MAX_PAIRED=3
 CONFIG_BT_BUF_EVT_RX_COUNT=16
 CONFIG_BT_BUF_EVT_RX_SIZE=255
 CONFIG_BT_BUF_CMD_TX_SIZE=255
+CONFIG_BT_BUF_ACL_TX_SIZE=251
+CONFIG_BT_BUF_ACL_RX_SIZE=255
diff --git a/tests/bluetooth/tester/nrf5340_hci_ipc_cpunet.conf b/tests/bluetooth/tester/nrf5340_hci_ipc_cpunet.conf
index d0242ec36d5..91f6566f208 100644
--- a/tests/bluetooth/tester/nrf5340_hci_ipc_cpunet.conf
+++ b/tests/bluetooth/tester/nrf5340_hci_ipc_cpunet.conf
@@ -1,8 +1,5 @@
 # Apply this overlay at hci_ipc controller build
 CONFIG_BT_CTLR_CONN_ISO_LOW_LATENCY_POLICY=y
-CONFIG_BT_CTLR_DATA_LENGTH_MAX=100
-CONFIG_BT_BUF_ACL_RX_SIZE=100
 CONFIG_BT_CTLR_PERIPHERAL_ISO_EARLY_CIG_START=y
 CONFIG_BT_CTLR_ISOAL_PSN_IGNORE=y
 CONFIG_BT_MAX_CONN=3
-CONFIG_BT_MAX_PAIRED=3