diff --git a/src/getting-started/01.00.BUILD.md b/src/getting-started/01.00.BUILD.md
index 4ed17e7..44fda3c 100644
--- a/src/getting-started/01.00.BUILD.md
+++ b/src/getting-started/01.00.BUILD.md
@@ -237,6 +237,7 @@ and cargo will automatically add `--target thumbv6m-none-eabi`.
 #![no_main]
 
 extern crate panic_halt;
+extern crate microbit;
 
 use cortex_m_rt::entry;
 
@@ -272,6 +273,7 @@ An easy way to implement this is to use an infinite loop.
 #![no_main]
 
 extern crate panic_halt;
+extern crate microbit;
 
 use cortex_m_rt::entry;