diff --git a/artiq/firmware/bootloader/main.rs b/artiq/firmware/bootloader/main.rs
index 545e3a73c..f44f0b757 100644
--- a/artiq/firmware/bootloader/main.rs
+++ b/artiq/firmware/bootloader/main.rs
@@ -12,7 +12,7 @@ use crc::crc32;
 use byteorder::{ByteOrder, BigEndian};
 use board_misoc::{ident, cache, sdram, boot, mem as board_mem};
 #[cfg(has_ethmac)]
-use board_misoc::{clock, config, ethmac, net_settings};
+use board_misoc::{clock, ethmac, net_settings};
 use board_misoc::uart_console::Console;
 
 fn check_integrity() -> bool {
@@ -151,7 +151,7 @@ fn flash_boot() {
 
 #[cfg(has_ethmac)]
 fn network_boot() {
-    use smoltcp::wire::{EthernetAddress, IpAddress, IpCidr};
+    use smoltcp::wire::IpCidr;
 
     println!("Initializing network...");
 
@@ -161,33 +161,28 @@ fn network_boot() {
     let mut neighbor_map = [None; 2];
     let neighbor_cache =
         smoltcp::iface::NeighborCache::new(&mut neighbor_map[..]);
-    let mut ip_addrs = [IpCidr::new(ip_addr, 0)];
     let net_addresses = net_settings::get_adresses();
     println!("network addresses: {}", net_addresses);
+    let mut ip_addrs = [
+        IpCidr::new(net_addresses.ipv4_addr, 0),
+        IpCidr::new(net_addresses.ipv6_ll_addr, 0),
+        IpCidr::new(net_addresses.ipv6_ll_addr, 0)
+    ];
     let mut interface = match net_addresses.ipv6_addr {
         Some(addr) => {
-            let ip_addrs = [
-                IpCidr::new(net_addresses.ipv4_addr, 0),
-                IpCidr::new(net_addresses.ipv6_ll_addr, 0),
-                IpCidr::new(addr, 0)
-            ];
+            ip_addrs[2] = IpCidr::new(addr, 0);
             smoltcp::iface::EthernetInterfaceBuilder::new(net_device)
                        .ethernet_addr(net_addresses.hardware_addr)
-                       .ip_addrs(ip_addrs)
+                       .ip_addrs(&mut ip_addrs[..])
                        .neighbor_cache(neighbor_cache)
                        .finalize()
         }
-        None => {
-            let ip_addrs = [
-                IpCidr::new(net_addresses.ipv4_addr, 0),
-                IpCidr::new(net_addresses.ipv6_ll_addr, 0)
-            ];
+        None =>
             smoltcp::iface::EthernetInterfaceBuilder::new(net_device)
                        .ethernet_addr(net_addresses.hardware_addr)
-                       .ip_addrs(ip_addrs)
+                       .ip_addrs(&mut ip_addrs[..2])
                        .neighbor_cache(neighbor_cache)
                        .finalize()
-        }
     };
 
     let mut socket_set_storage = [];
diff --git a/artiq/firmware/libboard_misoc/net_settings.rs b/artiq/firmware/libboard_misoc/net_settings.rs
index 3636c6924..1ab25b4e6 100644
--- a/artiq/firmware/libboard_misoc/net_settings.rs
+++ b/artiq/firmware/libboard_misoc/net_settings.rs
@@ -36,14 +36,8 @@ pub fn get_adresses() -> NetAddresses {
                 let eeprom = i2c_eeprom::EEPROM::kasli_eeprom();
                 hardware_addr =
                     eeprom.read_eui48()
-                    .map(|addr_buf| {
-                        let hardware_addr = EthernetAddress(addr_buf);
-                        hardware_addr
-                    })
-                    .unwrap_or_else(|e| {
-                        let hardware_addr = EthernetAddress([0x02, 0x00, 0x00, 0x00, 0x00, 0x21]);
-                        hardware_addr
-                    });
+                    .map(|addr_buf| EthernetAddress(addr_buf))
+                    .unwrap_or_else(|_e| EthernetAddress([0x02, 0x00, 0x00, 0x00, 0x00, 0x21]));
             }
             #[cfg(soc_platform = "sayma_amc")]
             { hardware_addr = EthernetAddress([0x02, 0x00, 0x00, 0x00, 0x00, 0x11]); }