diff --git a/Cargo.toml b/Cargo.toml
index 0bf83ab872a..115ca4ede32 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,7 +19,7 @@ plugin = true
 
 [dependencies]
 regex-syntax = "0.3.0"
-regex_macros = { version = "0.1.28", optional = true }
+regex_macros = { version = "0.1.33", optional = true }
 semver = "0.2.1"
 toml = "0.1"
 unicode-normalization = "0.1"
diff --git a/src/lib.rs b/src/lib.rs
index f5a3598a1ba..17f35e07537 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -35,7 +35,7 @@ extern crate semver;
 extern crate regex_syntax;
 
 extern crate rustc_plugin;
-
+extern crate rustc_const_eval;
 use rustc_plugin::Registry;
 
 pub mod consts;