diff --git a/commands/i2c.c b/commands/i2c.c
index 573032a..b74c535 100644
--- a/commands/i2c.c
+++ b/commands/i2c.c
@@ -129,7 +129,7 @@
 
 	buf = xmalloc(count);
 	for (i = 0; i < count; i++)
-		*(buf + i) = (char) simple_strtol(argv[optind+i], NULL, 16);
+		*(buf + i) = (char) simple_strtol(argv[optind+i], NULL, 0);
 
 	ret = i2c_write_reg(&client, reg | wide, buf, count);
 	if (ret != count) {