diff --git a/crates/cairo-serde/src/types/u256.rs b/crates/cairo-serde/src/types/u256.rs
index 9b04479..d518e95 100644
--- a/crates/cairo-serde/src/types/u256.rs
+++ b/crates/cairo-serde/src/types/u256.rs
@@ -73,9 +73,9 @@ impl BitOr for U256 {
 impl Display for U256 {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let mut num = BigUint::from(0u128);
-        num = num + BigUint::from(self.high);
-        num = num << 128;
-        num = num + BigUint::from(self.low);
+        num += BigUint::from(self.high);
+        num <<= 128;
+        num += BigUint::from(self.low);
         write!(f, "{}", num)
     }
 }