GANTS, C.J.

In this appeal, we consider whether a newly restructured sentence imposed on a defendant after he has successfully moved to vacate community parole supervision for life (CPSL) violates our double jeopardy doctrine. We conclude that, where a defendant sentenced to committed time on a conviction is resentenced to a term of probation, the new sentence violates double jeopardy where the defendant already has completed the original sentence on that conviction before the resentencing. But where the defendant has yet to complete the original sentence on a conviction, resentencing to a term of probation does not violate double jeopardy, provided that the total length of incarceration imposed on the defendant for that conviction is not increased. Consequently, if the defendant's probation were to be revoked, the defendant may not be sentenced to a term of incarceration longer than the time remaining on his original uncompleted sentence.

Background.

In 2002, the defendant, George Sallop, pleaded guilty to two indictments charging rape of a child with force (counts 1 and 2), one indictment charging assault and battery by means of a dangerous weapon (count 3), one indictment charging open and gross lewdness and lascivious behavior (count 4), and two indictments charging assault and battery (counts 5 and 6). He was sentenced to concurrent committed terms as follows: on counts 1 and 2, from ten to fifteen years in the State prison; on count 3, from nine to ten years in the State prison; on count 4, from two to three years in the State prison; and on counts 5 and 6, two and one-half years in a house of correction. In addition, on count 1, the defendant was sentenced to CPSL to be served from and after his release.

After we held that the CPSL statute was unconstitutionally vague as applied to first-time sex offenders, Commonwealth v. Pagan, 445 Mass. 161, 162 (2005),1 the defendant moved to correct his sentences. In 2009, after the defendant had served approximately eight years in prison,2 a different judge3 vacated the sentence of CPSL on count 1. The judge also restructured the sentence by vacating the sentences of committed time on counts 3 and 4 and replacing those sentences with two concurrent terms of ten years of probation to run from and after the completion of his sentences on counts 1 and 2, with global positioning system (GPS) monitoring a condition of probation. At the time of his resentencing, the defendant had fully served his original sentence as to count 4 and had approximately two years remaining to the end date of his original sentence as to count 3.

The defendant moved to vacate and correct the revised sentence, arguing that the GPS condition was improper. That motion was denied. The defendant again challenged the GPS condition, this time in a motion to vacate conditions of probation. That motion was likewise denied. A panel of the Appeals Court affirmed the denial in a decision pursuant to its rule 1:28. See Commonwealth v. Sallop, 85 Mass.App.Ct. 1123 (2014).

We granted the defendant's application for further appellate review, limited to an issue briefly addressed by the Appeals Court panel: the "propriety of resentencing the defendant by imposing a term of probation to run from and after committed sentences that either had been fully served at the time of the resentencing or will have been fully served before the probationary term is due to begin." Commonwealth v. Sallop, 469 Mass. 1110 (2014).4 Although this was not an issue addressed in the order appealed from, we address it out of concern that an injustice might otherwise arise in these circumstances from a violation of double jeopardy.

Discussion.

The resentencing judge was not obligated merely to vacate the CPSL portion of the defendant's sentence, but was permitted to restructure the over-all sentence to provide a lengthy period of probation supervision in place of the parole supervision that would have been provided with CPSL, provided the sentence did not violate double jeopardy. See Commonwealth v. Cole, 468 Mass. 294, 310 (2014) ("The vacating of CPSL sentences permits the possibility of resentencing, except where barred by double jeopardy"). Under double jeopardy principles, the new sentence on a conviction must not "increase the `aggregate punishment' imposed under the original sentence." Id., quoting Commonwealth v. Cumming, 466 Mass. 467, 468 (2013). In particular, double jeopardy principles bar resentencing on any conviction for which the defendant has already fully served his sentence. See Commonwealth v. Parrillo, 468 Mass. 318, 321-322 (2014), citing Cumming, supra at 473-474 (remanding with instructions not to resentence defendant on convictions as to which sentence had been fully served); Cole, supra at 311 (where defendant already served original sentence, "any resentencing . . . necessarily would violate principles of double jeopardy").5 The defendant, as noted, had fully served his original sentence as to count 4 when the resentencing judge vacated that sentence and replaced it with a ten-year term of probation. This necessarily increased his sentence on that count, violating double jeopardy principles.

As to count 3, the defendant had not fully served his original sentence at the time of resentencing; he had served approximately eight years on a sentence of from nine to ten years in prison. Resentencing therefore did not necessarily increase the defendant's punishment on this count. The resentencing judge, in her sound discretion, was permitted to impose a new sentence for count 3, so long as this did not otherwise violate double jeopardy principles. See Parrillo, 468 Mass. at 321; Cumming, 466 Mass. at 470-474 (upholding, with modification, imposition of ten years of probation in place of committed terms where original sentences were not completed at time of resentencing). The practical effect of the resentencing judge's decision as to count 3 was to replace the unserved portion of the defendant's sentence — approximately one to two years in the State prison — with ten years of probation. The resentencing judge was within her discretion to determine that this was consistent with the original sentencing scheme and that it did not increase the defendant's punishment as to count 3.

However, in Cumming, we recognized that the replacement of a CPSL sentence with a term of probation has the potential to increase the aggregate punishment imposed on a defendant if the defendant's probation were later revoked and the defendant were sentenced to a period of incarceration on that conviction that exceeds the time remaining on his original uncompleted sentence.6 See Cumming, 466 Mass. at 473-474. We noted that, whereas the statute prescribed certain limited periods of confinement for violating a condition of CPSL, see G. L. c. 127, §§ 133D (c), 149, "a violation of the conditions of his probation might subject the defendant to incarceration for the maximum . . . sentence attributable to each of the underlying . . . offenses." Cumming, supra at 473. To avoid increasing the defendant's punishment "in the peculiar circumstances of" Cumming, we ruled that "the maximum period of incarceration to which the defendant may be subject for violating a condition of his probation is the period of time between the defendant's resentencing. . . and the ten-year maximum period of confinement remaining under the six- to ten-year sentences originally imposed on the indictments on which he was resentenced." Id. at 474. The same "peculiar circumstances" are present in this case. Accordingly, the maximum period of incarceration to which the defendant may be subject for violating a condition of his probation on count 3 is the period of time between his resentencing on April 16, 2009, and the ten-year maximum period remaining under the nine- to ten-year sentence originally imposed on count 3.

Conclusion.

The order denying the defendant's motion to vacate the GPS condition of probation is affirmed for the reasons stated by the Appeals Court in its decision. The case is remanded to the Superior Court for resentencing consistent with this opinion. The original sentence on count 4, which the defendant has already fully served, shall be reinstated, and the probationary sentence on count 3 shall be amended to make clear that, if at any time during the probationary term the defendant violates his probation and his probation is revoked, he may not be sentenced to a term longer than the time remaining as of his resentencing on April 16, 2009, until the end date of his nine- to ten-year sentence originally imposed on count 3.

So ordered.