diff --git a/noir_stdlib/src/uint128.nr b/noir_stdlib/src/uint128.nr
index e99818bafa0..7b75cf4cae4 100644
--- a/noir_stdlib/src/uint128.nr
+++ b/noir_stdlib/src/uint128.nr
@@ -100,14 +100,14 @@ impl U128 {
     }
 
     fn decode_ascii(ascii: u8) -> Field {
-        if ascii < 58 {
+        (if ascii < 58 {
             ascii - 48
         } else {
             let ascii = ascii + 32 * (U128::uconstrained_check_is_upper_ascii(ascii) as u8);
             assert(ascii >= 97); // enforce >= 'a'
             assert(ascii <= 102); // enforce <= 'f'
             ascii - 87
-        } as Field
+        }) as Field
     }
 
     // TODO: Replace with a faster version.