diff --git a/CHANGELOG.md b/CHANGELOG.md
index d012007..32aa58d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,14 @@
 # Changelog
 
-## 0.3.2 — 2026-04-01
+## 0.3.3 — 2026-04-01
+
+### Fixed
+
+- **Fix compilation for downstream users** — `#[mutants::skip]` attribute was
+  not gated behind `cfg(test)`, causing unresolved module error when ucobs is
+  used as a dependency.
+
+## 0.3.2 — 2026-04-01 (yanked)
 
 ### Testing
 
diff --git a/Cargo.toml b/Cargo.toml
index f2c1a37..4f74aea 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "ucobs"
-version = "0.3.2"
+version = "0.3.3"
 edition = "2021"
 rust-version = "1.93"
 license = "MIT"
diff --git a/src/lib.rs b/src/lib.rs
index 334e0ff..2a47dfb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -167,7 +167,7 @@ const fn const_copy(dest: &mut [u8], di: usize, src: &[u8], n: usize) {
 }
 
 /// Fallback const copy for toolchains older than Rust 1.93.
-#[mutants::skip] // dead code under default features; tested via --features legacy-msrv
+#[cfg_attr(test, mutants::skip)] // dead code under default features
 #[inline(always)]
 #[cfg(feature = "legacy-msrv")]
 const fn const_copy(dest: &mut [u8], di: usize, src: &[u8], n: usize) {