diff --git a/tasks/ast_codegen/src/layout.rs b/tasks/ast_codegen/src/layout.rs
index af031aa4c58a1..4c9b52bb46775 100644
--- a/tasks/ast_codegen/src/layout.rs
+++ b/tasks/ast_codegen/src/layout.rs
@@ -99,7 +99,7 @@ impl KnownLayout {
                 2 => u16::MAX as u128,
                 4 => u32::MAX as u128,
                 8 => u64::MAX as u128,
-                16 => u128::MAX as u128,
+                16 => u128::MAX,
                 _ => unreachable!("We do not support paddings bigger than 16 bytes."),
             };
             self.consume_niches(n, can_resize);