diff --git a/lang/ast/expr/arith.c b/lang/ast/expr/arith.c
index eb548de..1704c32 100644
--- a/lang/ast/expr/arith.c
+++ b/lang/ast/expr/arith.c
@@ -991,7 +991,12 @@ struct token_parse_result arith_parse_label(
 		msg_expr->s_recipient = expr;
 		msg_expr->s_sub_type = EXPR_SUBTYPE_KEYWORD_MSG;
 		msg_expr->s_type = EXPR_TYPE_ARITH;
-		msg_expr->s_subexpr_depth = new_parser ? state->s_subexpr_depth + 1 : 0;
+		msg_expr->s_subexpr_depth = state->s_subexpr_depth;
+
+		if (new_parser) {
+			msg_expr->s_subexpr_depth++;
+		}
+
 		state = msg_expr;
 	}