diff --git a/common/cmd_spi.c b/common/cmd_spi.c
index 7b6faf7..a6fdf7f 100644
--- a/common/cmd_spi.c
+++ b/common/cmd_spi.c
@@ -119,7 +119,7 @@
 		printf("Error with the SPI transaction.\n");
 		rcode = 1;
 	} else {
-		cp = din;
+		cp = (char *)din;
 		for(j = 0; j < ((bitlen + 7) / 8); j++) {
 			printf("%02X", *cp++);
 		}