diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c
index d5c16392cd4d..2e2324453905 100644
--- a/drivers/spi/spi-sun4i.c
+++ b/drivers/spi/spi-sun4i.c
@@ -322,7 +322,7 @@ static int sun4i_spi_transfer_one(struct spi_controller *host,
 	sun4i_spi_enable_interrupt(sspi, SUN4I_INT_CTL_TC |
 					 SUN4I_INT_CTL_RF_F34);
 	/* Only enable Tx FIFO interrupt if we really need it */
-	if (tx_len > SUN4I_FIFO_DEPTH)
+	if (tx_len > SUN4I_FIFO_DEPTH - 1)
 		sun4i_spi_enable_interrupt(sspi, SUN4I_INT_CTL_TF_E34);
 
 	/* Start the transfer */