diff --git a/it87spi.c b/it87spi.c
index 7b38492..c1ed29c 100644
--- a/it87spi.c
+++ b/it87spi.c
@@ -98,7 +98,7 @@
 	return;
 }
 
-static int it8716f_spi_send_command(struct flashctx *flash,
+static int it8716f_spi_send_command(const struct flashctx *flash,
 				    unsigned int writecnt, unsigned int readcnt,
 				    const unsigned char *writearr,
 				    unsigned char *readarr);
@@ -276,7 +276,7 @@
  * commands with the address in inverse wire order. That's why the register
  * ordering in case 4 and 5 may seem strange.
  */
-static int it8716f_spi_send_command(struct flashctx *flash,
+static int it8716f_spi_send_command(const struct flashctx *flash,
 				    unsigned int writecnt, unsigned int readcnt,
 				    const unsigned char *writearr,
 				    unsigned char *readarr)