diff --git a/crates/artifacts/solc/src/ast/mod.rs b/crates/artifacts/solc/src/ast/mod.rs
index 31142f7c..c5ca8492 100644
--- a/crates/artifacts/solc/src/ast/mod.rs
+++ b/crates/artifacts/solc/src/ast/mod.rs
@@ -257,7 +257,7 @@ pub enum AssignmentOperator {
     ShlAssign,
 }
 
-ast_node!(
+expr_node!(
     /// A binary operation.
     struct BinaryOperation {
         common_type: TypeDescriptions,
@@ -938,7 +938,7 @@ stmt_node!(
     /// A return statement.
     struct Return {
         expression: Option<Expression>,
-        function_return_parameters: usize,
+        function_return_parameters: Option<usize>,
     }
 );