diff --git a/src/lib.rs b/src/lib.rs
index 87b8c00..530614c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -64,6 +64,7 @@ extern crate serde;
 #[macro_use]
 pub(crate) mod macros;
 
+#[allow(unused_imports)]
 #[cfg(any(feature = "betrusted", test))]
 #[macro_use]
 extern crate engine25519_as;
diff --git a/src/ristretto.rs b/src/ristretto.rs
index d284b5b..b29fd33 100644
--- a/src/ristretto.rs
+++ b/src/ristretto.rs
@@ -194,6 +194,7 @@ use traits::{MultiscalarMul, VartimeMultiscalarMul, VartimePrecomputedMultiscala
     feature = "simd_backend",
     any(target_feature = "avx2", target_feature = "avx512ifma")
 )))]
+#[cfg(not(feature = "betrusted"))]
 use backend::serial::scalar_mul;
 #[cfg(all(
     feature = "simd_backend",
diff --git a/src/scalar.rs b/src/scalar.rs
index 00de740..773dcb4 100644
--- a/src/scalar.rs
+++ b/src/scalar.rs
@@ -998,6 +998,7 @@ impl Scalar {
 
     /// Returns a size hint indicating how many entries of the return
     /// value of `to_radix_2w` are nonzero.
+    #[cfg(not(feature = "betrusted"))]
     pub(crate) fn to_radix_2w_size_hint(w: usize) -> usize {
         debug_assert!(w >= 4);
         debug_assert!(w <= 8);