diff --git a/crates/specialized/rtx-cfd/src/solvers/incompressible/three_d/piso_device.rs b/crates/specialized/rtx-cfd/src/solvers/incompressible/three_d/piso_device.rs
index f95b68b..03a5ad7 100644
--- a/crates/specialized/rtx-cfd/src/solvers/incompressible/three_d/piso_device.rs
+++ b/crates/specialized/rtx-cfd/src/solvers/incompressible/three_d/piso_device.rs
@@ -361,7 +361,7 @@ impl Piso3Device {
         one[0]
     }
 
-    fn launch_sides(&self, prm: P3Params, ptrs: P3Ptrs, stamp: i32) {
+    fn launch_sides(&self, prm: P3Params, ptrs: &P3Ptrs, stamp: i32) {
         let rt = runtime3();
         let k = kernels();
         let g = self.grid;
@@ -396,7 +396,7 @@ impl Piso3Device {
         self.upload_tables(t);
         let prm = self.params(1.0);
         let ptrs = self.ptrs();
-        self.launch_sides(prm, ptrs, 1);
+        self.launch_sides(prm, &ptrs, 1);
         self.initialized = true;
     }
 
@@ -450,10 +450,10 @@ impl Piso3Device {
                 .expect("predict_w");
         }
         // Outlet zero-gradient + periodic copy (no stamping), then u* = u.
-        self.launch_sides(prm, ptrs, 0);
+        self.launch_sides(prm, &ptrs, 0);
         // The new interval's boundary data.
         self.upload_tables(t_new);
-        self.launch_sides(prm, ptrs, 1);
+        self.launch_sides(prm, &ptrs, 1);
         rt.stream
             .memcpy_dtod(&self.u, &mut self.u_star)
             .expect("u*");
@@ -527,7 +527,7 @@ impl Piso3Device {
                     .expect("correct_w");
             }
             if prm.periodic_z != 0 {
-                self.launch_sides(prm, ptrs, 0);
+                self.launch_sides(prm, &ptrs, 0);
             }
             unsafe {
                 rt.stream