diff --git a/src/operations.rs b/src/operations.rs
index ffd3b1a..5f027f4 100644
--- a/src/operations.rs
+++ b/src/operations.rs
@@ -128,7 +128,7 @@ pub(crate) fn aesenc(value: u128, xor: u128) -> u128 {
     use core::mem::transmute;
     unsafe {
         let value = transmute(value);
-        transmute(vaesmcq_u8(vaeseq_u8(value, transmute(xor))))
+        xor ^ transmute::<_, u128>(vaesmcq_u8(vaeseq_u8(value, transmute(0u128))))
     }
 }
 
@@ -163,7 +163,7 @@ pub(crate) fn aesdec(value: u128, xor: u128) -> u128 {
     use core::mem::transmute;
     unsafe {
         let value = transmute(value);
-        transmute(vaesimcq_u8(vaesdq_u8(value, transmute(xor))))
+        xor ^ transmute::<_, u128>(vaesimcq_u8(vaesdq_u8(value, transmute(0u128))))
     }
 }