diff --git a/substrate/candidate-agreement/src/bft/accumulator.rs b/substrate/candidate-agreement/src/bft/accumulator.rs
index 69d6329f9b..a0c99698df 100644
--- a/substrate/candidate-agreement/src/bft/accumulator.rs
+++ b/substrate/candidate-agreement/src/bft/accumulator.rs
@@ -158,7 +158,7 @@ impl<C, D, V, S> Accumulator<C, D, V, S>
 		let (sender, signature) = (message.sender, message.signature);
 
 		match message.message {
-			Message::Propose(_, p) => self.import_proposal(p, sender, signature),
+			Message::Propose(_, p) => self.import_proposal(p, sender),
 			Message::Prepare(_, d) => self.import_prepare(d, sender, signature),
 			Message::Commit(_, d) => self.import_commit(d, sender, signature),
 			Message::AdvanceRound(_) => self.import_advance_round(sender),
@@ -169,7 +169,6 @@ impl<C, D, V, S> Accumulator<C, D, V, S>
 		&mut self,
 		proposal: C,
 		sender: V,
-		signature: S,
 	) {
 		if sender != self.round_proposer || self.proposal.is_some() { return }
 
diff --git a/substrate/candidate-agreement/src/bft/mod.rs b/substrate/candidate-agreement/src/bft/mod.rs
index da4b6fe91d..74476b98b0 100644
--- a/substrate/candidate-agreement/src/bft/mod.rs
+++ b/substrate/candidate-agreement/src/bft/mod.rs
@@ -16,12 +16,6 @@
 
 //! BFT Agreement based on a rotating proposer in different rounds.
 
-use std::collections::{HashMap, HashSet};
-use std::hash::Hash;
-
-use futures::{IntoFuture, Future, Stream, Sink};
-use futures::future::{ok, loop_fn, Loop};
-
 mod accumulator;
 
 /// Messages over the proposal.