diff --git a/benches/bls12_381/fr.rs b/benches/bls12_381/fr.rs
index 9cab671..13b0d0e 100644
--- a/benches/bls12_381/fr.rs
+++ b/benches/bls12_381/fr.rs
@@ -1,6 +1,6 @@
 use rand::{Rand, SeedableRng, XorShiftRng};
 
-use ff::{Field, PrimeField, PrimeFieldRepr};
+use ff::{Field, PrimeField, PrimeFieldRepr, SqrtField};
 use pairing::bls12_381::*;
 
 #[bench]