diff --git a/sim/mcuboot-sys/src/lib.rs b/sim/mcuboot-sys/src/lib.rs
index 16bd6c3..9f5e6b5 100644
--- a/sim/mcuboot-sys/src/lib.rs
+++ b/sim/mcuboot-sys/src/lib.rs
@@ -1,3 +1,4 @@
+#[macro_use] extern crate lazy_static;
 extern crate libc;
 #[macro_use] extern crate log;
 extern crate simflash;