diff --git a/crates/kernel/src/blend_smlib.rs b/crates/kernel/src/blend_smlib.rs
index b3863f7c2d..ae2a1011c9 100644
--- a/crates/kernel/src/blend_smlib.rs
+++ b/crates/kernel/src/blend_smlib.rs
@@ -71,7 +71,6 @@ enum Kind {
     Chamfer,
 }
 
-#[cfg(feature = "smlib")]
 mod imp {
     use std::collections::BTreeSet;
 
@@ -284,33 +283,7 @@ mod imp {
     }
 }
 
-#[cfg(not(feature = "smlib"))]
-mod imp {
-    use solidcraft_geom::Vec3;
-
-    use super::Kind;
-    use crate::blend_variable::RadiusSpline;
-    use crate::body::Body;
-    use crate::{KernelError, Result};
-
-    fn not_built() -> KernelError {
-        KernelError::Invalid("not supported yet: this build has no SMLib".into())
-    }
-
-    pub(super) fn blend(_: &Body, _: &str, _: Kind, _: &[Vec3], _: &[f64]) -> Result<Body> {
-        Err(not_built())
-    }
-
-    pub(super) fn variable(_: &Body, _: Vec3, _: Vec3, _: &RadiusSpline) -> Result<Body> {
-        Err(not_built())
-    }
-
-    pub(super) fn sides(_: &Body, _: &[Vec3], _: f64, _: crate::ChamferSide, _: bool) -> Result<Body> {
-        Err(not_built())
-    }
-}
-
-#[cfg(all(test, feature = "smlib"))]
+#[cfg(test)]
 #[allow(clippy::unwrap_used, clippy::expect_used)]
 mod tests {
     use solidcraft_geom::Vec3;
diff --git a/crates/kernel/src/surfaces.rs b/crates/kernel/src/surfaces.rs
index 78546a74a3..dc3cbd01a3 100644
--- a/crates/kernel/src/surfaces.rs
+++ b/crates/kernel/src/surfaces.rs
@@ -1194,7 +1194,6 @@ fn open_sections(sections: &[(Plane, Vec<Seg2>)]) -> Result<Vec<crate::loft_rail
 }
 
 /// SMLib's side of this module.
-#[cfg(feature = "smlib")]
 mod imp {
     use solidcraft_smlib::sweeps::{Affine, Curve, Ends, SweepFrame};
     use solidcraft_smlib::{Brep as SmBrep, CheckLevel};
@@ -1547,51 +1546,6 @@ mod imp {
     }
 }
 
-#[cfg(not(feature = "smlib"))]
-mod imp {
-    use super::*;
-
-    fn not_built() -> KernelError {
-        refuse("surfaces: this build has no SMLib (feature `smlib`)")
-    }
-    pub(super) fn refuse(what: &str) -> KernelError {
-        crate::smlib_sweeps::refuse(what)
-    }
-    pub(super) fn stitched(_: &Brep, _: f64) -> Result<(Body, Option<History>)> {
-        Err(not_built())
-    }
-    pub(super) fn thicken(_: &Body, _: f64, _: bool) -> Result<Body> {
-        Err(not_built())
-    }
-    pub(super) fn offset_face(_: &Brep, _: usize, _: f64) -> Result<Brep> {
-        Err(not_built())
-    }
-    pub(super) fn extruded(_: &Plane, _: &[Numbered], _: Vec3, _: f64) -> Result<Brep> {
-        Err(not_built())
-    }
-    pub(super) fn revolved(_: &Plane, _: &[Numbered], _: Vec3, _: Vec3, _: f64) -> Result<Brep> {
-        Err(not_built())
-    }
-    pub(super) fn swept(_: &Plane, _: &[Numbered], _: &[crate::PathSeg], _: bool) -> Result<Brep> {
-        Err(not_built())
-    }
-    pub(super) fn cornered(
-        _: &Plane,
-        _: &[Numbered],
-        _: &[crate::PathSeg],
-        _: &[std::ops::Range<usize>],
-        _: bool,
-    ) -> Result<Vec<(Brep, Vec<FaceProv>)>> {
-        Err(not_built())
-    }
-    pub(super) fn swept_stations(_: &Plane, _: &[Numbered], _: &[crate::PathSeg], _: &crate::SweepControl) -> Result<Brep> {
-        Err(not_built())
-    }
-    pub(super) fn lofted(_: &[&solidcraft_geom::bspline::CurveN<4>]) -> Result<Brep> {
-        Err(not_built())
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;