diff --git a/drivers/gpu/drm/nouveau/nvif/mmu.c b/drivers/gpu/drm/nouveau/nvif/mmu.c
index ae08a1ca8044..5641bda2046d 100644
--- a/drivers/gpu/drm/nouveau/nvif/mmu.c
+++ b/drivers/gpu/drm/nouveau/nvif/mmu.c
@@ -110,7 +110,7 @@ nvif_mmu_init(struct nvif_object *parent, s32 oclass, struct nvif_mmu *mmu)
 
 	if (mmu->kind_nr) {
 		struct nvif_mmu_kind_v0 *kind;
-		u32 argc = sizeof(*kind) + sizeof(*kind->data) * mmu->kind_nr;
+		size_t argc = struct_size(kind, data, mmu->kind_nr);
 
 		if (ret = -ENOMEM, !(kind = kmalloc(argc, GFP_KERNEL)))
 			goto done;