diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index 736b2658245f..37ff4ec7db76 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -389,7 +389,7 @@ ioat_alloc_ring(struct dma_chan *c, int order, gfp_t flags)
 		struct ioat_descs *descs = &ioat_chan->descs[i];
 
 		descs->virt = dma_alloc_coherent(to_dev(ioat_chan),
-						 SZ_2M, &descs->hw, flags);
+					IOAT_CHUNK_SIZE, &descs->hw, flags);
 		if (!descs->virt) {
 			int idx;