diff --git a/bls12_377/src/fields/fq2.rs b/bls12_377/src/fields/fq2.rs
index 52f7e18..fa479e1 100644
--- a/bls12_377/src/fields/fq2.rs
+++ b/bls12_377/src/fields/fq2.rs
@@ -22,11 +22,8 @@ impl Fp2Config for Fq2Config {
 
     #[inline(always)]
     fn mul_fp_by_nonresidue_in_place(fe: &mut Self::Fp) -> &mut Self::Fp {
-        let original = *fe;
         fe.neg_in_place();
-        fe.double_in_place();
-        fe.double_in_place();
-        *fe -= original;
+        *fe = *fe + fe.double_in_place().double_in_place();
         fe
     }
 
@@ -39,12 +36,12 @@ impl Fp2Config for Fq2Config {
     }
 
     #[inline(always)]
-    fn add_and_mul_fp_by_nonresidue_plus_one(y: &mut Self::Fp, x: &Self::Fp) {
+    fn mul_fp_by_nonresidue_plus_one_and_add(y: &mut Self::Fp, x: &Self::Fp) {
         y.double_in_place().double_in_place().neg_in_place();
         *y += x;
     }
 
-    fn add_and_mul_fp_by_nonresidue_in_place(y: &mut Self::Fp, x: &Self::Fp) {
+    fn mul_fp_by_nonresidue_in_place_and_add(y: &mut Self::Fp, x: &Self::Fp) {
         let mut original = *y;
         original.double_in_place().double_in_place();
         original += &*y;
diff --git a/bls12_381/src/fields/fq2.rs b/bls12_381/src/fields/fq2.rs
index 3abfb61..34f0f6c 100644
--- a/bls12_381/src/fields/fq2.rs
+++ b/bls12_381/src/fields/fq2.rs
@@ -31,11 +31,11 @@ impl Fp2Config for Fq2Config {
     }
 
     #[inline(always)]
-    fn add_and_mul_fp_by_nonresidue_plus_one(y: &mut Self::Fp, x: &Self::Fp) {
+    fn mul_fp_by_nonresidue_plus_one_and_add(y: &mut Self::Fp, x: &Self::Fp) {
         *y = *x;
     }
 
-    fn add_and_mul_fp_by_nonresidue_in_place(y: &mut Self::Fp, x: &Self::Fp) {
+    fn mul_fp_by_nonresidue_in_place_and_add(y: &mut Self::Fp, x: &Self::Fp) {
         y.neg_in_place();
         *y += x;
     }