diff --git a/cimery/crates/kernel/src/occt.rs b/cimery/crates/kernel/src/occt.rs
index dd46a2f..e931903 100644
--- a/cimery/crates/kernel/src/occt.rs
+++ b/cimery/crates/kernel/src/occt.rs
@@ -179,7 +179,7 @@ mod inner {
             let hw  = bww * 0.5;
             let hbt = bwt * 0.5;
             let profile = vec![(-hw, -hbt), (hw, -hbt), (hw, hbt), (-hw, hbt)];
-            let mut m = workplane_extrude_xz_y(&profile, bwh)?;
+            let m = workplane_extrude_xz_y(&profile, bwh)?;
             // Breast wall at footing top, Y=0..bwh
             parts.push(m);
         }