diff --git a/src/avx2/verify.rs b/src/avx2/verify.rs
index af87fa9..0005484 100644
--- a/src/avx2/verify.rs
+++ b/src/avx2/verify.rs
@@ -23,8 +23,9 @@ pub fn verify(a: &[u8], b: &[u8], mut len: usize) -> u8 {
 
 pub fn cmov(r: &mut [u8], x: &[u8], mut len: usize, mut b: u8) {
     let (mut xvec, mut rvec);
+    b = b.wrapping_neg();
     unsafe {
-        let bvec = _mm256_set1_epi64x(b as i64);
+        let bvec = _mm256_set1_epi8(b as i8);
         for i in 0..(len / 32) {
             rvec = _mm256_loadu_si256(r[32 * i..].as_ptr() as *const __m256i);
             xvec = _mm256_loadu_si256(x[32 * i..].as_ptr() as *const __m256i);
@@ -34,7 +35,6 @@ pub fn cmov(r: &mut [u8], x: &[u8], mut len: usize, mut b: u8) {
     }
     let idx = 32 * (len / 32);
     len -= idx;
-    b = b.wrapping_neg();
     for i in 0..len {
         r[idx + i] ^= b & (x[idx + i] ^ r[idx + i]);
     }