diff --git a/drivers/gpu/drm/nouveau/core/subdev/vm/nv04.c b/drivers/gpu/drm/nouveau/core/subdev/vm/nv04.c
index 6adbbc9..1e2f736 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/vm/nv04.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/vm/nv04.c
@@ -97,8 +97,8 @@ nv04_vmmgr_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 
 	priv->base.create = nv04_vm_create;
 	priv->base.limit = NV04_PDMA_SIZE;
-	priv->base.dma_bits = 32;
-	priv->base.pgt_bits = 32 - 12;
+	priv->base.dma_bits = 31;
+	priv->base.pgt_bits = 31 - 12;
 	priv->base.spg_shift = 12;
 	priv->base.lpg_shift = 12;
 	priv->base.map_sg = nv04_vm_map_sg;