Louia McKenzie appeals from the denial of his pro se motion to vacate his sentence. He contends that he received an illegal sentence when the trial court imposed two concurrent, mandatory minimum terms of fifteen years in prison pursuant to D.C.Code § 22-3202(a) (1981) following his convictions for assault with intent to kill while armed and armed robbery.1 The trial court denied appellant’s motion on the ground that this court had addressed it previously in McKenzie v. United States, 659 A.2d 838 (D.C.1995).
Acknowledging that we did not address appellant’s illegal sentence claim in the direct appeal, the government admits that the trial court was in error. Moreover, the government now concedes that appellant’s two concurrent, mandatory minimum fifteen-year terms were not authorized by D.C.Code § 22-3202(a) and hence were illegal. The government accordingly asks us to remand the case for the trial court to correct the mandatory minimum designation in appellant’s sentence to reflect that § 22-3202(a) permits only a five-year mandatory minimum term for each offense.
In his briefs in this court, appellant raises several other challenges to his convictions and sentence. As appellant did not present these other challenges to the trial court, they are not properly before us and we shall not consider them. See Wu v. United States, 798 A.2d 1083, 1091 n. 13 (D.C.2002).
We reverse the denial of appellant’s motion to vacate his sentence and remand *463with directions to the trial court to resen-tence appellant in accordance with law.
So ordered.