diff --git a/ethcore/src/blockchain/generator/generator.rs b/ethcore/src/blockchain/generator/generator.rs
index 51e6294fc..88c9577e2 100644
--- a/ethcore/src/blockchain/generator/generator.rs
+++ b/ethcore/src/blockchain/generator/generator.rs
@@ -29,7 +29,7 @@ pub trait ChainIterator: Iterator + Sized {
 	/// Blocks generated by fork will have lower difficulty than current chain.
 	fn fork(&self, fork_number: usize) -> Fork<Self> where Self: Clone;
 	/// Should be called to make every consecutive block have given bloom.
-	fn with_bloom<'a>(&'a mut self, bloom: H2048) -> Bloom<'a, Self>;
+	fn with_bloom(&mut self, bloom: H2048) -> Bloom<Self>;
 	/// Should be called to complete block. Without complete, block may have incorrect hash.
 	fn complete<'a>(&'a mut self, finalizer: &'a mut BlockFinalizer) -> Complete<'a, Self>;
 	/// Completes and generates block.
@@ -44,7 +44,7 @@ impl<I> ChainIterator for I where I: Iterator + Sized {
 		}
 	}
 
-	fn with_bloom<'a>(&'a mut self, bloom: H2048) -> Bloom<'a, Self> {
+	fn with_bloom(&mut self, bloom: H2048) -> Bloom<Self> {
 		Bloom {
 			iter: self,
 			bloom: bloom