DANIEL S. PEARSON, Judge.

On January 27, 1982, this court, after hearing argument on the petition for writ of habeas corpus and the State's response, granted the writ and directed the respondent to release forthwith the petitioner from custody. We now set forth the reasons for our action.

Jenrette was incarcerated at the Dade Correctional Institute in the custody of the respondent. He claimed that as of October 5, 1981, he was being unlawfully held under an order of the Florida Parole and Probation Commission, which established Jenrette's presumptive parole release date as May 5, 1983.

Jenrette claimed that the Commission unlawfully increased his salient factor score, which, in turn, changed the matrix time range for his offense category from 18 to 39 months to 58 to 79 months. Had his salient factor score not been increased, Jenrette would have been entitled to be released at the end of 39 months, or in October 1981, not, as the Commission decided, in 58 months, or May 1983.

The increase of the salient factor score was first explained by the Commission in its order entered on Jenrette's request for review:

". . . The Commission on May 27, 1981, did not agree with the recommendation of the Hearing Examiners and changed the salient factor score from 0 to 2 based on a conviction in Atlanta, Georgia on August 25, 1951 for Simple Larceny and a sentence of 12 months.

". . . The conviction and sentence at age 16 gives the inmate a new salient factor score of two, however, it does alter his matrix time range. The Ancient History Rule does not apply in this area according to Florida Administrative Rule 23-19.04.

"The appeal is denied, and the presumptive parole release date remains the same. You were set at the bottom of the matrix range of 58 to 79 months with a presumptive parole release date of May 5, 1983."

This decision in hand, Jenrette petitioned this court for a writ of habeas corpus. The petition was accompanied by Jenrette's affidavit, which stated that in August 1951, when, at age 16, he was convicted in Georgia, he was financially unable to employ counsel to represent him; he was not advised of his right to, or provided with, appointed counsel; and he was convicted and sentenced to twelve months in prison without the assistance of counsel.

At oral argument, the respondent, for the first time, conceded that the facts set forth in Jenrette's affidavit should be accepted as true. We would have done this even in the absence of this late and begrudging concession. Section 79.01, Florida Statutes (1981), expressly provides that a habeas petitioner may meet his initial burden of proof, see, e.g., Coleman v. State ex rel. Race, 118 Fla. 201, 159 So. 504, 505 (1935), by affidavit:

"When any person detained in custody, whether charged with a criminal offense or not, applies . . . for a writ of habeas corpus and shows by affidavit or evidence probable cause to believe that he is detained without lawful authority, the court . . . shall grant the writ forthwith . . . returnable immediately."

Jenrette having satisfied his burden, and this court having issued its preliminary writ, it was incumbent upon respondent to controvert the averred facts. The respondent's failure to even allege, much less prove, that the conviction at issue was valid required us to accept Jenrette's affidavit as true. Vellucci v. Cochran, 138 So.2d 510, 511 (Fla. 1962); State ex rel. Libtz v. Coleman, 149 Fla. 29, 5 So.2d 60 (1941); Moon v. Smith, 138 Fla. 410, 189 So. 835, 837-38 (1939).

It is therefore an established fact that Jenrette's 1951 Georgia conviction was obtained without the assistance or offer of counsel despite his insolvency. That conviction, which resulted in a twelve-month commitment, is accordingly invalid under the Sixth and Fourteenth Amendments. Scott v. Illinois, 440 U.S. 367, 99 S.Ct. 1158, 59 L.Ed.2d 383 (1979); Argersinger v. Hamlin, 407 U.S. 25, 92 S.Ct. 2006, 32 L.Ed.2d 530 (1972); Gideon v. Wainwright, 372 U.S. 335, 83 S.Ct. 792, 9 L.Ed.2d 799 (1963). Even as a prior uncounseled conviction cannot be used to penalize an accused in a subsequent prosecution or sentencing, Baldasar v. Illinois, 446 U.S. 222, 100 S.Ct. 1585, 64 L.Ed.2d 169 (1980); Loper v. Beto, 405 U.S. 473, 92 S.Ct. 1014, 31 L.Ed.2d 374 (1972); United States v. Tucker, 404 U.S. 443, 92 S.Ct. 589, 30 L.Ed.2d 592 (1972); Burgett v. Texas, 389 U.S. 109, 88 S.Ct. 258, 19 L.Ed.2d 319 (1967), a prior uncounseled conviction cannot be used in determining eligibility for parole. Moore v. Florida Parole and Probation Commission, 289 So.2d 719 (Fla.), cert. denied, 417 U.S. 935, 94 S.Ct. 2649, 41 L.Ed.2d 239 (1974). As the court stated in Moore:

"[W]hile there is no absolute right to parole, there is a right to a proper consideration for parole. And this should be free from the consequences of a conviction not meeting the standards of Gideon v. Wainwright, [supra]. The Parole Commission is required, as any other body, to comply with constitutional requirements; it cannot deny parole upon illegal grounds or upon improper considerations. . . ." Id. at 720.

A "commitment" to prison based upon an unlawful conviction is quite clearly as unlawful as the judgment which supports it. With Jenrette's prior conviction or commitment eliminated from consideration, as Moore requires, his proper salient factor score is zero, and the matrix time range which applies is 18 to 39 months, not 58 to 79 months.

Finally, we address respondent's assertion that even if the 1951 conviction of petitioner is invalid, "the Commission should be given the opportunity to recalculate the Petitioner's presumptive parole release date," and to reinstate the aggravating factors found by the hearing examiners, but not relied upon by the Commission. Relying upon Section 947.16(4), Florida Statutes (1979), respondent asserted that "[i]f the Commission is unable to utilize the 1951 conviction to extend the Petitioner's presumptive parole release date, it may well decide to follow the recommendation of the hearing examiner and impose as an aggravating factor the concurrent sentences received by the Petitioner."

The Commission might well have decided to do what respondent suggests; however, Florida law forbids it. First, the very provision relied upon by respondent, Section 947.16(4), specifically states that the Commission may from time to time review the parole date established for an inmate, but that "the presumptive parole release date shall not be changed except for reasons of institutional conduct or the acquisition of new information not available at the time of the initial interview." In the present case, the parole examiner recommended a nine-month aggravation of the presumptive parole release date based upon a concurrent sentence imposed upon petitioner. This recommendation was specifically rejected by the Commission. It is self-evident that the existence of the concurrent sentence is not new or previously unavailable information upon which the Commission could rely under Section 947.16(4).

Moreover, the decision in McKahn v. Florida Parole and Probation Commission, 399 So.2d 476 (Fla. 1st DCA 1981), with which we agree, bars recomputation of the presumptive parole release date in the manner suggested by respondent. In McKahn, the petitioner asserted that the Commission had improperly characterized the offense for which he had been convicted in determining the appropriate matrix range. The First District Court of Appeal issued an order to show cause and thereafter ordered the Commission to reduce the matrix range appropriately and to recalculate the presumptive parole release date. After receiving this order, the Commission informed the court that it had previously reduced the matrix range, but had added an additional aggravating factor not previously found "and reached the same presumptive parole release date as previously entered." McKahn v. Florida Parole and Probation Commission, supra, at 477-78. The court held this coincidental revision unlawful:

"Under the circumstances, the Commission was vested with no discretion to change the offense characteristic, or the salient factor score, or to add an additional aggravating factor in its determination of a parole date. Section 947.172(3) unambiguously states that a presumptive parole release date `shall become binding on the commission when agreement on a . . . date is reached.' The only explicitly stated exceptions to the binding effect of the date are `for reasons of institutional conduct or the acquisition of new information not available at the time of the initial interview.' Section 947.16(4). Additionally, we are of the opinion that Section 947.16(4) should be considered in pari materia with Section 947.173(3), permitting the Commission to modify a parole release date `for good cause in exceptional circumstances.' The record fails to show the applicability of any exceptional circumstance. What the Commission has sought to do here is to circumvent the effect of the statute precluding the changing of a presumptive parole release date — without showing the existence of any statutory exceptions, or offering any exceptional circumstances for the modification — by manipulating the criteria upon which parole decisions are made, thereby reaching the same date previously established. This it cannot do." Id. at 478.

The ruling in McKahn that the Commission had no authority to "add an aggravating factor after it had previously entered its order fixing a presumptive parole release date," 399 So.2d at 478, is dispositive of the respondent's request for remand to the Commission.

For the foregoing reasons, we have granted the writ of habeas corpus.