ments in violation of 18 U.S.C.A. § 1028(a)(6) (West Supp.1999).
On September 25,1991, Pregent pleaded guilty to two counts of the indictment. On January 2, 1992, the district court sentenced Pregent to serve thirty-seven months in prison on each of the two counts. The two sentences were to be served concurrently with each other and with a ten-year sentence Pregent received for a 1989 North Carolina conviction for obtaining property by false pretense, forgery, and uttering. The district court also sentenced Pregent to a thirty-six-month term of supervised release following his imprisonment. Pregent did not appeal his sentence.
After sentencing in the district court, Pregent was returned to the custody of the North Carolina Department of Corrections to serve out the remainder of his ten-year sentence for the 1989 conviction and to begin his concurrent federal sentence. He remained in the North Carolina prison system until May 14, 1994, at which time he was transferred to the federal prison system to complete his thirty-seven-month term. He remained in federal custody until September 9, 1994. After Pregent’s release from federal custody, he was transferred to New Hampshire to serve a two to four-year sentence that he was required to serve consecutively to the North Carolina and federal sentences.
Pregent was released from New Hampshire prison into the custody of a federal halfway house on October 19, 1996, where he remained for six months pursuant to the terms of his supervised release as handed down at his January 2, 1992, sentencing hearing. He was released from the halfway house on April 27, 1997, and remains on supervised release.
II.
On November 24, 1997, Pregent filed a motion for modification of his supervised release in the United States District Court for the Eastern District of North Carolina.1 The motion was filed pursuant to the authority granted in 18 U.S.C.A. § 3588(e) (West Supp.1999), which authorizes the sentencing court to terminate, extend, or revoke terms of supervised release upon consideration of certain factors outlined in 18 U.S.C.A. § 3553 (West Supp. 1999). See 18 U.S.C.A. § 3583(e).
In his motion, Pregent urged the district court to terminate his supervised release because his initial sentence had been miscalculated. Specifically, Pregent noted that two prior convictions were erroneously assigned criminal history points under the Sentencing Guidelines when those convictions encompassed activity that was already included as part of the relevant offense conduct. Pregent also asserted that because those same state offenses formed the basis of his 1989 North Carolina conviction and were part of the same course of conduct as his federal conviction, the district court should have credited him for the time already served in the North Carolina prison system pursuant to U.S.S.G. § 5G1.3(b) (1991). As a result of these miscalculations, Pregent stated that he had remained in prison for thirty-two months longer than he would have under a correctly calculated Guidelines sentence. For purposes of Pregent’s motion, the Government conceded sentencing error.2
1
Pregent filed an earlier motion for modification of his supervised release on December 27, 1994. The district court determined that the motion was premature, as he had not yet served a full year on supervised release as required by 18 U.S.C.A. § 3583(e) (West Supp.1999). We affirmed the district court's denial of the motion. See United States v. Pregent, 67 F.3d 298 (4th Cir.1995) (Table). In our affirmance we noted that Pregent had raised issues regarding the application of the Sentencing Guidelines for the first time on appeal of his motion, and, therefore, those arguments were not properly before this Court. See id.
2
. The Government assumed that error had occurred at sentencing in its response to Pre-gent’s motion in the district court, but did not comment on the extent of the possible error. During oral argument, the Government stated that any sentencing error that had occurred *282was limited to four months. Similarly, Pre-gent concedes on appeal that he may not have been incarcerated for thirty-two months too long, but rather may have remained in prison beyond the appropriate term only for the additional months spent solely in federal custody from May 14, 1994 — September 9, 1994.