diff --git a/sw/device/cheriot/buffer_overflow/buffer_overflow.cc b/sw/device/cheriot/buffer_overflow/buffer_overflow.cc
index 70a0b8e..40f0454 100644
--- a/sw/device/cheriot/buffer_overflow/buffer_overflow.cc
+++ b/sw/device/cheriot/buffer_overflow/buffer_overflow.cc
@@ -26,7 +26,7 @@
   char b2[5] = "BBBB";
   Debug::log(b1);
   Debug::log(b2);
-  for (int i = 0; inp[i] != '\0' /*&& i < sizeof(b1)*/; i++) {
+  for (int i = 0; inp[i] != '\0' /*&& i < sizeof(b1)-1*/; i++) {
     b1[i] = inp[i];
   }
   Debug::log(b1);
diff --git a/sw/device/cheriot/buffer_overflow/xmake.lua b/sw/device/cheriot/buffer_overflow/xmake.lua
index bd8b6ab..7ed2f95 100644
--- a/sw/device/cheriot/buffer_overflow/xmake.lua
+++ b/sw/device/cheriot/buffer_overflow/xmake.lua
@@ -25,7 +25,7 @@
 set_toolchains("cheriot-clang")
 
 option("board")
-    set_default("sail")
+    set_default("sencha")
 
 -- Support libraries
 includes(path.join(sdkdir, "lib"))