diff --git a/client_eth.ml b/client_eth.ml
index 87965c2..798ea5e 100644
--- a/client_eth.ml
+++ b/client_eth.ml
@@ -35,7 +35,7 @@ let classify t ip =
   match ip with
   | Ipaddr.V6 _ -> `External ip
   | Ipaddr.V4 ip4 ->
-  if ip4 === t.client_gw then `Client_gateway
+  if ip4 = t.client_gw then `Client_gateway
   else match lookup t ip4 with
   | Some client_link -> `Client client_link
   | None when Ipaddr.V4.Prefix.mem ip4 t.prefix -> `Unknown_client ip
@@ -48,7 +48,7 @@ module ARP = struct
   }
 
   let lookup t ip =
-    if ip === t.net.client_gw then Some t.client_link#my_mac
+    if ip = t.net.client_gw then Some t.client_link#my_mac
     else match IpMap.find ip t.net.iface_of_ip with
     | Some client_iface -> Some client_iface#other_mac
     | None -> None
@@ -97,7 +97,7 @@ module ARP = struct
     let open Arpv4_wire in
     let req_ipv4 = Ipaddr.V4.of_int32 (get_arp_tpa frame) in
     Log.info "who-has %s?" (fun f -> f (Ipaddr.V4.to_string req_ipv4));
-    if req_ipv4 === t.client_link#other_ip then (
+    if req_ipv4 = t.client_link#other_ip then (
       Log.info "ignoring request for client's own IP" Logs.unit;
       None
     ) else match lookup t req_ipv4 with
diff --git a/client_net.ml b/client_net.ml
index 7409743..03d37ac 100644
--- a/client_net.ml
+++ b/client_net.ml
@@ -30,7 +30,7 @@ let input_arp ~fixed_arp ~eth request =
 (** Handle an IPv4 packet from the client. *)
 let input_ipv4 ~client_ip ~router frame packet =
   let src = Wire_structs.Ipv4_wire.get_ipv4_src packet |> Ipaddr.V4.of_int32 in
-  if src === client_ip then Firewall.ipv4_from_client router frame
+  if src = client_ip then Firewall.ipv4_from_client router frame
   else (
     Log.warn "Incorrect source IP %a in IP packet from %a (dropping)"
       (fun f -> f Ipaddr.V4.pp_hum src Ipaddr.V4.pp_hum client_ip);
diff --git a/unikernel.ml b/unikernel.ml
index 4b5c6fa..8d54153 100644
--- a/unikernel.ml
+++ b/unikernel.ml
@@ -62,7 +62,7 @@ module Main (Clock : V1.CLOCK) = struct
     Log.info "agents connected in %.3f s (CPU time used since boot: %.3f s)"
       (fun f -> f (Clock.time () -. start_time) (Sys.time ()));
     (* Watch for shutdown requests from Qubes *)
-    let shutdown_rq = OS.Lifecycle.await_shutdown () >|= function `Poweroff | `Reboot -> () in
+    let shutdown_rq = OS.Lifecycle.await_shutdown () >>= function `Poweroff | `Reboot -> return () in
     (* Set up networking *)
     let net_listener = network qubesDB in
     (* Run until something fails or we get a shutdown request. *)
diff --git a/uplink.ml b/uplink.ml
index dbe9f82..fa53f84 100644
--- a/uplink.ml
+++ b/uplink.ml
@@ -44,11 +44,7 @@ module Make(Clock : V1.CLOCK) = struct
 
   let connect config =
     let ip = config.Dao.uplink_our_ip in
-    Netif.connect "tap0" >>= function
-    | `Error (`Unknown msg) -> failwith msg
-    | `Error `Disconnected -> failwith "Disconnected"
-    | `Error `Unimplemented -> failwith "Unimplemented"
-    | `Ok net ->
+    Netif.connect "tap0" >>= or_fail "Can't connect uplink device" >>= fun net ->
     Eth.connect net >>= or_fail "Can't make Ethernet device for tap" >>= fun eth ->
     Arp.connect eth >>= or_fail "Can't add ARP" >>= fun arp ->
     Arp.add_ip arp ip >>= fun () ->
diff --git a/utils.ml b/utils.ml
index 2ea2cb4..a02f088 100644
--- a/utils.ml
+++ b/utils.ml
@@ -52,8 +52,6 @@ let fixup_checksums frame =
     in
     [just_headers; higherlevel_data]
 
-let (===) a b = (Ipaddr.V4.compare a b = 0)
-
 let error fmt =
   let err s = Failure s in
   Printf.ksprintf err fmt