--- a/crates/evm-coder/src/solidity.rs
+++ b/crates/evm-coder/src/solidity.rs
@@ -180,9 +180,16 @@
 			fn is_simple() -> bool {
 				false
 			}
+			#[allow(unused_assignments)]
 			fn solidity_default(writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result {
 				write!(writer, "{}(", tc.collect_tuple::<Self>())?;
+				let mut first = true;
 				$(
+					if !first {
+						write!(writer, ",")?;
+					} else {
+						first = false;
+					}
 					<$ident>::solidity_default(writer, tc)?;
 				)*
 				write!(writer, ")")