The issue presented by this appeal is whether the district court, following the vacatur of a conviction for using a firearm during the course of a drug offense, see 18 U.S.C. § 924(c), in a 28 U.S.C. § 2255 proceeding, has jurisdiction to resentence the defendant on remaining related convictions. We hold the district court has such authority.1

Defendant pleaded guilty to conspiring to possess heroin and cocaine, with the intent to distribute, 21 U.S.C. § 846, and using or carrying a firearm during and in relation to a drug trafficking offense, 18 U.S.C. § 924(c). The district court imposed an eighty-seven month sentence on the conspiracy count and a consecutive sixty-month sentence for the firearm conviction. We affirmed those sentences on appeal. See United States v. Mendoza, No. 93-6034, 1993 WL 503123 (10th Cir. Dec.8, 1993).

Defendant then filed a § 2255 motion, challenging the firearm conviction in light of Bailey v. United States, --- U.S. ----, 116 S. Ct. 501, 133 L. Ed. 2d 472 (1995).2 The government conceded defendant's conviction was invalid under Bailey and the district court, therefore, vacated the firearm conviction and sentence. However, the district court then resentenced defendant on the conspiracy conviction to one hundred eight months' imprisonment, after enhancing defendant's base offense calculation by two levels for possessing a weapon during that offense. See U.S.S.G. § 2D1.1(b)(1). At the time of resentencing, defendant had not yet fully served the sentence originally imposed on the conspiracy conviction. Defendant appeals the resentencing.3

We review de novo the district court's determination that it had jurisdiction to resentence defendant on the conspiracy conviction. See United States v. Moore, 83 F.3d 1231, 1233 (10th Cir.1996). We affirm, and in doing so, we join seven other circuits which have also held that a district court has authority to resentence a defendant on unchallenged related convictions, after vacating a § 924(c) conviction in a § 2255 proceeding. See United States v. Morris, 116 F.3d 501, 503 (D.C.Cir.1997); United States v. Rodriguez, 114 F.3d 46, 47-48 (5th Cir.1997); United States v. Harrison, 113 F.3d 135, 137 (8th Cir.1997); United States v. Davis, 112 F.3d 118, 119, 123 (3d Cir.1997); United States v. Rodriguez, 112 F.3d 26, 27, 30-31 (1st Cir.1997); United States v. Hillary, 106 F.3d 1170, 1170 (4th Cir.1997); United States v. Smith, 103 F.3d 531, 533-35 (7th Cir.1996), cert. denied, --- U.S. ----, 117 S. Ct. 1861, 137 L. Ed. 2d 1061 (1997); cf. United States v. Handa, 110 F.3d 42, 43-44 (9th Cir.1997) (holding that, although district court did not have authority to resentence defendant under § 2255, in light of government's concession that § 2255 proceedings are interchangeable with those addressing Fed.R.Crim.P. 35 motions and Ninth Circuit precedent precluding resentencing defendant on any conviction not raised in Rule 35 motion, district court could resentence defendant pursuant to appellate court's vacatur of his "entire" sentence and remand for resentencing).

Had the firearm conviction been vacated on direct appeal, the district court unquestionably would have had authority to resentence defendant on the remaining conspiracy conviction, and, in doing so, to apply U.S.S.G. § 2D1.1(b)(1)'s two-level enhancement of the base offense level for possessing a firearm during the underlying offense. See Lang, 81 F.3d at 963-64. But defendant asserts that the district court does not have jurisdiction to do so within the context of a § 2255 proceeding. We disagree. See Davis, 112 F.3d at 122 n. 4 (to limit resentencing under these circumstances to direct appeals "would create an unacceptable windfall for habeas petitioners").

A district court does not have inherent authority to modify a previously imposed sentence; it may do so only pursuant to statutory authorization. See United States v. Blackwell, 81 F.3d 945, 947-48, 949 (10th Cir.1996) (applying 18 U.S.C. § 3582(c)). Section 2255 provides the necessary authority in this case.

Section 2255 permits "[a] prisoner in custody under sentence of a court established by Act of Congress claiming the right to be released upon [specified grounds, to] move the court which imposed the sentence to vacate, set aside or correct the sentence."4 If the court determines that the defendant is entitled to relief under § 2255, then the statute requires that the court "vacate and set the judgment aside and ... discharge the prisoner or resentence him or grant a new trial or correct the sentence as may appear appropriate."

In this case, once the district court determined that defendant was entitled to § 2255 relief from his § 924(c) conviction, that court was obligated to set aside the judgment, which encompassed both convictions and sentences. See I Rec., doc. 120. Following vacatur of that judgment, it was appropriate for the district court to resentence defendant on the conspiracy conviction, in light of the interdependence of that sentence and the vacated § 924(c) sentence. See, e.g., Morris, 116 F.3d at 504-05; Davis, 112 F.3d at 120-23; Rodriguez, 112 F.3d at 29-31; United States v. Binford, 108 F.3d 723, 728-29 (7th Cir.), cert. denied, --- U.S. ----, 117 S. Ct. 2530, 138 L. Ed. 2d 1029 (1997).

Had defendant never been convicted under § 924(c), the district court would have enhanced the sentence on the conspiracy conviction by increasing the base offense calculation by two levels for possessing a dangerous weapon during that offense. See U.S.S.G. § 2D1.1(b)(1). That enhancement, however, is not available where a defendant is also convicted, under § 924(c), of using or carrying a firearm in relation to a drug offense. See id. § 2K2.4 comment (background); see also Lang, 81 F.3d at 963. Instead, the § 924(c) conviction requires the district court to impose a mandatory minimum five-year sentence, to be served consecutive to any other term of imprisonment. See 18 U.S.C. § 924(c)(1). In this case, therefore, defendant's § 924(c) conviction precluded enhancing the conspiracy sentence under U.S.S.G. § 2D1.1(b)(1). The district court's subsequent vacatur of the § 924(c) conviction, however, removed any impediment to application of the § 2D1.1(b)(1) enhancement. See Lang, 81 F.3d at 963.

"Clearly, the § 924(c) offense and the underlying offense are interdependent and result in an aggregate sentence, not sentences which may be treated discretely." Davis, 112 F.3d at 121; see also United States v. Smith, 116 F.3d 857, 859 (10th Cir.1996) (sentencing guideline provisions operate inter-dependently; sentence under these guidelines "constitutes a sentencing package which takes into account all counts upon which the defendant has been convicted"). In light of § 2255's language and the interdependence of defendant's conspiracy and firearm sentences, see Smith, 116 F.3d at 859, the district court possessed authority under § 2255 to resentence defendant on the § 846 conspiracy conviction, after having vacated the § 924(c) conviction and sentence.

Defendant further argues that the district court's authority to resentence him under § 2255 was limited because he did not challenge either the conspiracy conviction or sentence in his § 2255 motion. The specific issues the defendant raises in a § 2255 motion, however, do not circumscribe the district court's authority when resentencing becomes necessary. See Moore, 83 F.3d at 1235. Rather, "where the district court ... ordered the vacation [under § 2255], it has the discretion to determine the scope of the resentencing." Id.

Although defendant, in this appeal, does not assert any double jeopardy or due process challenge to his resentencing, he does argue generally that resentencing is contrary to the finality to be afforded sentences in the § 2255 context. Because he challenged one of several interdependent sentences in his § 2255 motion, however, defendant does not have a legitimate expectation of finality in a related, but unchallenged, sentence. See Davis, 112 F.3d at 122 n. 4; see also, e.g., Davis, 112 F.3d at 123-24 (addressing due process argument); Binford, 108 F.3d at 729 (addressing double jeopardy argument).

On appeal, defendant does not challenge the district court's application of U.S.S.G. § 2D1.1(b)(1) to the facts of this case. We, therefore, AFFIRM the district court's resentencing defendant on the conspiracy conviction, after vacating the related § 924(c) firearm conviction.