diff --git a/common/cmd_sf.c b/common/cmd_sf.c
index 2d463a8..d571f60 100644
--- a/common/cmd_sf.c
+++ b/common/cmd_sf.c
@@ -48,7 +48,7 @@
 			goto usage;
 	}
 	if (argc >= 4) {
-		mode = simple_strtoul(argv[3], &endp, 0);
+		mode = simple_strtoul(argv[3], &endp, 16);
 		if (*argv[3] == 0 || *endp != 0)
 			goto usage;
 	}