diff --git a/core/src/pow/lean.rs b/core/src/pow/lean.rs
index 5a001522..c5bca2c5 100644
--- a/core/src/pow/lean.rs
+++ b/core/src/pow/lean.rs
@@ -90,6 +90,7 @@ mod test {
 	use super::*;
 	use pow::common;
 	use pow::cuckatoo::*;
+	use pow::types::PoWContext;
 
 	#[test]
 	fn lean_miner() {