diff --git a/samples/bluetooth/hci_uart/nrf5.conf b/samples/bluetooth/hci_uart/nrf5.conf
index 9f7325cc41f..14389ab45d2 100644
--- a/samples/bluetooth/hci_uart/nrf5.conf
+++ b/samples/bluetooth/hci_uart/nrf5.conf
@@ -7,8 +7,9 @@ CONFIG_UART_INTERRUPT_DRIVEN=y
 CONFIG_UART_NRF5_BAUD_RATE=1000000
 CONFIG_UART_NRF5_FLOW_CONTROL=y
 CONFIG_MAIN_STACK_SIZE=512
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=512
 CONFIG_BLUETOOTH=y
 CONFIG_BLUETOOTH_HCI_RAW=y
-CONFIG_BLUETOOTH_MAX_CONN=20
+CONFIG_BLUETOOTH_MAX_CONN=16
 CONFIG_BLUETOOTH_CONTROLLER_ASSERT_HANDLER=y
 CONFIG_BLUETOOTH_TINYCRYPT_ECC=n