diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index b652071a209671ad3c37c29df0409c28dccf0fe4..b106e8a60af642ad213e1a21a08b24d749d4673f 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -710,7 +710,7 @@ static int sprd_dma_config(struct dma_chan *chan, struct sprd_dma_desc *sdesc,
 	return 0;
 }
 
-struct dma_async_tx_descriptor *
+static struct dma_async_tx_descriptor *
 sprd_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
 			 size_t len, unsigned long flags)
 {