diff --git a/core/src/pow/mod.rs b/core/src/pow/mod.rs
index 375ee0eee..0eb637a45 100644
--- a/core/src/pow/mod.rs
+++ b/core/src/pow/mod.rs
@@ -104,6 +104,7 @@ mod test {
 	use super::*;
 	use core::target::Difficulty;
 	use genesis;
+  use consensus::MINIMUM_DIFFICULTY;
 
 	#[test]
 	fn genesis_pow() {
diff --git a/grin/tests/framework.rs b/grin/tests/framework.rs
index e2e77935b..236b9df33 100644
--- a/grin/tests/framework.rs
+++ b/grin/tests/framework.rs
@@ -20,7 +20,7 @@ extern crate grin_api as api;
 extern crate grin_wallet as wallet;
 extern crate secp256k1zkp as secp;
 
-extern crate blake2;
+extern crate blake2_rfc as blake2;;
 extern crate env_logger;
 extern crate futures;
 extern crate tokio_core;