diff --git a/src/bls12_381/fq.rs b/src/bls12_381/fq.rs
index 2b4b7a6..2661aa5 100644
--- a/src/bls12_381/fq.rs
+++ b/src/bls12_381/fq.rs
@@ -1,5 +1,5 @@
 use super::fq2::Fq2;
-use {Field, PrimeField, PrimeFieldDecodingError, PrimeFieldRepr};
+use ff::{Field, PrimeField, PrimeFieldDecodingError, PrimeFieldRepr};
 
 // B coefficient of BLS12-381 curve, 4.
 pub const B_COEFF: Fq = Fq(FqRepr([
diff --git a/src/bls12_381/fq12.rs b/src/bls12_381/fq12.rs
index 2bec0b1..b24fcaa 100644
--- a/src/bls12_381/fq12.rs
+++ b/src/bls12_381/fq12.rs
@@ -1,8 +1,8 @@
 use super::fq::FROBENIUS_COEFF_FQ12_C1;
 use super::fq2::Fq2;
 use super::fq6::Fq6;
+use ff::Field;
 use rand::{Rand, Rng};
-use Field;
 
 /// An element of Fq12, represented by c0 + c1 * w.
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
@@ -182,7 +182,7 @@ fn test_fq12_mul_by_014() {
 
 #[test]
 fn fq12_field_tests() {
-    use PrimeField;
+    use ff::PrimeField;
 
     ::tests::field::random_field_tests::<Fq12>();
     ::tests::field::random_frobenius_tests::<Fq12, _>(super::fq::Fq::char(), 13);
diff --git a/src/bls12_381/fq2.rs b/src/bls12_381/fq2.rs
index 1f3cd6f..7ae159f 100644
--- a/src/bls12_381/fq2.rs
+++ b/src/bls12_381/fq2.rs
@@ -1,6 +1,6 @@
 use super::fq::{FROBENIUS_COEFF_FQ2_C1, Fq, NEGATIVE_ONE};
+use ff::{Field, SqrtField};
 use rand::{Rand, Rng};
-use {Field, SqrtField};
 
 use std::cmp::Ordering;
 
@@ -272,7 +272,7 @@ fn test_fq2_basics() {
 #[test]
 fn test_fq2_squaring() {
     use super::fq::FqRepr;
-    use PrimeField;
+    use ff::PrimeField;
 
     let mut a = Fq2 {
         c0: Fq::one(),
@@ -346,7 +346,7 @@ fn test_fq2_squaring() {
 #[test]
 fn test_fq2_mul() {
     use super::fq::FqRepr;
-    use PrimeField;
+    use ff::PrimeField;
 
     let mut a = Fq2 {
         c0: Fq::from_repr(FqRepr([
@@ -410,7 +410,7 @@ fn test_fq2_mul() {
 #[test]
 fn test_fq2_inverse() {
     use super::fq::FqRepr;
-    use PrimeField;
+    use ff::PrimeField;
 
     assert!(Fq2::zero().inverse().is_none());
 
@@ -459,7 +459,7 @@ fn test_fq2_inverse() {
 #[test]
 fn test_fq2_addition() {
     use super::fq::FqRepr;
-    use PrimeField;
+    use ff::PrimeField;
 
     let mut a = Fq2 {
         c0: Fq::from_repr(FqRepr([
@@ -523,7 +523,7 @@ fn test_fq2_addition() {
 #[test]
 fn test_fq2_subtraction() {
     use super::fq::FqRepr;
-    use PrimeField;
+    use ff::PrimeField;
 
     let mut a = Fq2 {
         c0: Fq::from_repr(FqRepr([
@@ -587,7 +587,7 @@ fn test_fq2_subtraction() {
 #[test]
 fn test_fq2_negation() {
     use super::fq::FqRepr;
-    use PrimeField;
+    use ff::PrimeField;
 
     let mut a = Fq2 {
         c0: Fq::from_repr(FqRepr([
@@ -634,7 +634,7 @@ fn test_fq2_negation() {
 #[test]
 fn test_fq2_doubling() {
     use super::fq::FqRepr;
-    use PrimeField;
+    use ff::PrimeField;
 
     let mut a = Fq2 {
         c0: Fq::from_repr(FqRepr([
@@ -681,7 +681,7 @@ fn test_fq2_doubling() {
 #[test]
 fn test_fq2_frobenius_map() {
     use super::fq::FqRepr;
-    use PrimeField;
+    use ff::PrimeField;
 
     let mut a = Fq2 {
         c0: Fq::from_repr(FqRepr([
@@ -794,7 +794,7 @@ fn test_fq2_frobenius_map() {
 #[test]
 fn test_fq2_sqrt() {
     use super::fq::FqRepr;
-    use PrimeField;
+    use ff::PrimeField;
 
     assert_eq!(
         Fq2 {
@@ -900,7 +900,7 @@ fn test_fq2_mul_nonresidue() {
 
 #[test]
 fn fq2_field_tests() {
-    use PrimeField;
+    use ff::PrimeField;
 
     ::tests::field::random_field_tests::<Fq2>();
     ::tests::field::random_sqrt_tests::<Fq2>();
diff --git a/src/bls12_381/fq6.rs b/src/bls12_381/fq6.rs
index c065f27..36c6e28 100644
--- a/src/bls12_381/fq6.rs
+++ b/src/bls12_381/fq6.rs
@@ -1,7 +1,7 @@
 use super::fq::{FROBENIUS_COEFF_FQ6_C1, FROBENIUS_COEFF_FQ6_C2};
 use super::fq2::Fq2;
+use ff::Field;
 use rand::{Rand, Rng};
-use Field;
 
 /// An element of Fq6, represented by c0 + c1 * v + c2 * v^(2).
 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
@@ -367,7 +367,7 @@ fn test_fq6_mul_by_01() {
 
 #[test]
 fn fq6_field_tests() {
-    use PrimeField;
+    use ff::PrimeField;
 
     ::tests::field::random_field_tests::<Fq6>();
     ::tests::field::random_frobenius_tests::<Fq6, _>(super::fq::Fq::char(), 13);
diff --git a/src/tests/curve.rs b/src/tests/curve.rs
index 1480b74..bb0406c 100644
--- a/src/tests/curve.rs
+++ b/src/tests/curve.rs
@@ -1,6 +1,7 @@
+use ff::Field;
 use rand::{Rand, Rng, SeedableRng, XorShiftRng};
 
-use {CurveAffine, CurveProjective, EncodedPoint, Field};
+use {CurveAffine, CurveProjective, EncodedPoint};
 
 pub fn curve_tests<G: CurveProjective>() {
     let mut rng = XorShiftRng::from_seed([0x5dbe6259, 0x8d313d76, 0x3237db17, 0xe5bc0654]);
@@ -66,8 +67,8 @@ pub fn curve_tests<G: CurveProjective>() {
 }
 
 fn random_wnaf_tests<G: CurveProjective>() {
+    use ff::PrimeField;
     use wnaf::*;
-    use PrimeField;
 
     let mut rng = XorShiftRng::from_seed([0x5dbe6259, 0x8d313d76, 0x3237db17, 0xe5bc0654]);
 
diff --git a/src/tests/repr.rs b/src/tests/repr.rs
index 681a476..09dd441 100644
--- a/src/tests/repr.rs
+++ b/src/tests/repr.rs
@@ -1,5 +1,5 @@
+use ff::PrimeFieldRepr;
 use rand::{SeedableRng, XorShiftRng};
-use PrimeFieldRepr;
 
 pub fn random_repr_tests<R: PrimeFieldRepr>() {
     random_encoding_tests::<R>();