diff --git a/sys/dev/drm/radeon/radeon_vm.c b/sys/dev/drm/radeon/radeon_vm.c
--- a/sys/dev/drm/radeon/radeon_vm.c
+++ b/sys/dev/drm/radeon/radeon_vm.c
@@ -450,7 +450,8 @@
 {
 	uint64_t size = radeon_bo_size(bo_va->bo);
 	struct radeon_vm *vm = bo_va->vm;
-	unsigned last_pfn, pt_idx;
+	uint64_t last_pfn;
+	unsigned pt_idx;
 	uint64_t eoffset;
 	int r;