diff --git a/src/util/scaling.rs b/src/util/scaling.rs
index be339784..9409d49c 100644
--- a/src/util/scaling.rs
+++ b/src/util/scaling.rs
@@ -16,7 +16,7 @@ use crate::polynomial::polynomial::PolynomialCoeffs;
 /// This struct abstract away these operations by implementing Horner's method and keeping track
 /// of the number of multiplications by `a` to compute the scaling factor.
 /// See https://github.com/mir-protocol/plonky2/pull/69 for more details and discussions.
-#[derive(Debug, Copy, Clone)]
+#[derive(Debug, Clone)]
 pub struct ReducingFactor<F: Field> {
     base: F,
     count: u64,
@@ -79,7 +79,7 @@ impl<F: Field> ReducingFactor<F> {
     }
 }
 
-#[derive(Debug, Copy, Clone)]
+#[derive(Debug, Clone)]
 pub struct ReducingFactorTarget<const D: usize> {
     base: ExtensionTarget<D>,
     count: u64,