diff --git a/src/lib.rs b/src/lib.rs
index c537772..2d6afff 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -9,6 +9,8 @@
 
 #![no_std]
 
+#[cfg(feature = "avr-std-stub")] extern crate avr_std_stub;
+
 pub use self::register::{Register, RegisterBits, RegisterValue};
 pub use self::pin::{DataDirection, Pin};