diff --git a/src/bit_utilities.rs b/src/bit_utilities.rs
index 78186b8..e4433d8 100644
--- a/src/bit_utilities.rs
+++ b/src/bit_utilities.rs
@@ -198,11 +198,10 @@ pub fn binary_subtraction(minuend: &BasicRegister, subtrahend: &BasicRegister) -
 
     match final_carry {
         true => {
-            let mut complement = vec![false; difference.len() - 1];
-            complement.append(&mut vec![true]);
+            let mut complement: Vec<bool> = vec![false; difference.len() - 1];
+            complement.extend([true]);
             binary_sum(&difference, &BasicRegister::new(complement.into()))
         }
         false => difference.negated(),
     }
-    // BasicRegister::default()
 }