1 files changed, 6 insertions, 1 deletions
diff --git a/src/engine.rs b/src/engine.rs
index 6c69bc1..3269dff 100644
--- a/src/engine.rs
+++ b/src/engine.rs
@@ -2,8 +2,11 @@
 //!
 //! This predominantly allows implementation of a [`u16`] executor.
 
-use std::io::{Cursor, Read};
+#[cfg(feature = "bigint-engine")]
+use std::io::Cursor;
+use std::io::Read;
 
+#[cfg(feature = "bigint-engine")]
 use byteorder::{BigEndian, ReadBytesExt};
 use num_traits::{One, Unsigned, WrappingAdd, WrappingSub, Zero};
 use thiserror::Error;
@@ -66,6 +69,7 @@ impl Engine for executor::U8 {
 	}
 }
 
+#[cfg(feature = "engine-u16")]
 impl Engine for executor::U16 {
 	type TapeInner = u16;
 
@@ -89,6 +93,7 @@ impl Engine for executor::U16 {
 	}
 }
 
+#[cfg(feature = "engine-u32")]
 impl Engine for executor::U32 {
 	type TapeInner = u32;