diff --git a/common/route/awooter/rust/src/lib.rs b/common/route/awooter/rust/src/lib.rs
index b070d567..6a9b4974 100644
--- a/common/route/awooter/rust/src/lib.rs
+++ b/common/route/awooter/rust/src/lib.rs
@@ -8,6 +8,8 @@ use colored::Colorize;
 use indicatif::{ProgressBar, ProgressStyle};
 use rayon::prelude::*;
 
+use crate::npnr::PortRef;
+
 #[macro_use]
 mod npnr;
 
@@ -312,11 +314,10 @@ fn partition_nets(
         let arcs = nets
             .users_by_name(*name)
             .unwrap()
-            .iter()
+            .par_iter()
             .flat_map(|sink| {
-                let sink = unsafe { sink.as_ref().unwrap() };
-                ctx.sink_wires(net, sink)
-                    .into_iter()
+                ctx.sink_wires(net, (*sink) as *const PortRef)
+                    .into_par_iter()
                     .map(move |sink_wire| (sink, sink_wire))
             })
             .flat_map(|(sink, sink_wire)| {
@@ -682,7 +683,6 @@ fn route(ctx: &mut npnr::Context) -> bool {
     let mut y1 = 0;
 
     for sink in nets.users_by_name(*name).unwrap().iter() {
-        let sink = unsafe { sink.as_ref().unwrap() };
         let cell = sink.cell().unwrap().location();
         x0 = x0.min(cell.x);
         y0 = y0.min(cell.y);
diff --git a/common/route/awooter/rust/src/npnr.rs b/common/route/awooter/rust/src/npnr.rs
index 3af18727..3814e407 100644
--- a/common/route/awooter/rust/src/npnr.rs
+++ b/common/route/awooter/rust/src/npnr.rs
@@ -319,7 +319,7 @@ extern "C" {
 /// Store for the nets of a context.
 pub struct Nets<'a> {
     nets: HashMap<IdString, *mut NetInfo>,
-    users: HashMap<IdString, &'a [*mut PortRef]>,
+    users: HashMap<IdString, &'a [&'a mut PortRef]>,
     _data: PhantomData<&'a Context>,
 }
 
@@ -347,7 +347,7 @@ impl<'a> Nets<'a> {
             // Leaking memory is the most convenient FFI I could think of.
             let len =
                 unsafe { npnr_netinfo_users_leak(net, &mut users_ptr as *mut *mut *mut PortRef) };
-            let users_slice = unsafe { slice::from_raw_parts(users_ptr, len as usize) };
+            let users_slice = unsafe { slice::from_raw_parts(users_ptr as *mut &mut PortRef, len as usize) };
             nets.insert(name, net);
             users.insert(name, users_slice);
         }
@@ -360,7 +360,7 @@ impl<'a> Nets<'a> {
     }
 
     /// Find net users given a net's name.
-    pub fn users_by_name(&self, net: IdString) -> Option<&&[*mut PortRef]> {
+    pub fn users_by_name(&self, net: IdString) -> Option<&&[&mut PortRef]> {
         self.users.get(&net)
     }