diff --git a/Cargo.toml b/Cargo.toml
index c4358b8c3..31932a137 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,3 +16,4 @@ rand = "0.*"
 tiny-keccak = "0.3"
 rocksdb = "0.2.1"
 num = "0.1"
+lazy_static = "0.1.*"
diff --git a/src/lib.rs b/src/lib.rs
index aec47b96f..0a7c14ca9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,6 +10,9 @@ extern crate tiny_keccak;
 extern crate num;
 #[macro_use]
 extern crate log;
+#[macro_use]
+extern crate lazy_static;
+
 #[macro_use]
 pub mod macros;
 
@@ -27,6 +30,7 @@ pub mod overlaydb;
 pub mod math;
 //pub mod filter;
 pub mod chainfilter;
+pub mod trie;
 
 //pub mod network;