diff --git a/gf127/avx/gf127.go b/gf127/avx/gf127.go
index 4072981..e77aeb2 100644
--- a/gf127/avx/gf127.go
+++ b/gf127/avx/gf127.go
@@ -16,10 +16,8 @@ type GF127 = gf127.GF127
 
 const msb64 = uint64(1) << 63
 
-var (
-	// x127x63 represents x^127 + x^63. Used in assembly file.
-	x127x63 = GF127{msb64, msb64}
-)
+// x127x63 represents x^127 + x^63. Used in assembly file.
+var x127x63 = GF127{msb64, msb64} //nolint:deadcode,varcheck
 
 // Add sets c to a+b.
 func Add(a, b, c *GF127)
diff --git a/tz/avx.go b/tz/avx.go
index 09793ef..913c7e2 100644
--- a/tz/avx.go
+++ b/tz/avx.go
@@ -17,7 +17,7 @@ var _ hash.Hash = (*digest)(nil)
 
 var (
 	minmax  = [2]GF127{{0, 0}, {math.MaxUint64, math.MaxUint64}}
-	x127x63 = GF127{1 << 63, 1 << 63}
+	x127x63 = GF127{1 << 63, 1 << 63} //nolint:deadcode,varcheck
 )
 
 func newAVX() *digest {
diff --git a/tz/sl2.go b/tz/sl2.go
index e0a4d8a..f7ca1d4 100644
--- a/tz/sl2.go
+++ b/tz/sl2.go
@@ -54,7 +54,7 @@ func (c *sl2) UnmarshalBinary(data []byte) (err error) {
 	return
 }
 
-func (c *sl2) mulStrassen(a, b *sl2, x *[8]GF127) *sl2 {
+func (c *sl2) mulStrassen(a, b *sl2, x *[8]GF127) *sl2 { //nolint:unused
 	// strassen algorithm
 	avx.Add(&a[0][0], &a[1][1], &x[0])
 	avx.Add(&b[0][0], &b[1][1], &x[1])