diff --git a/src/json.rs b/src/json.rs
index 42d6cdc..58f4f9c 100644
--- a/src/json.rs
+++ b/src/json.rs
@@ -10,7 +10,6 @@
 
 use errors::{Error, ErrorKind};
 use runtest::ProcRes;
-use serde_json;
 use std::path::Path;
 use std::str::FromStr;
 
diff --git a/src/read2.rs b/src/read2.rs
index 402f0ff..442c910 100644
--- a/src/read2.rs
+++ b/src/read2.rs
@@ -35,7 +35,6 @@ mod imp {
 
 #[cfg(unix)]
 mod imp {
-    use libc;
     use std::io;
     use std::io::prelude::*;
     use std::mem;
diff --git a/src/runtest.rs b/src/runtest.rs
index 943b15d..d153fcd 100644
--- a/src/runtest.rs
+++ b/src/runtest.rs
@@ -14,7 +14,6 @@ use common::{Assembly, Incremental, MirOpt, RunMake, Ui};
 use common::{Codegen, CodegenUnits, DebugInfoGdb, DebugInfoLldb, Rustdoc};
 use common::{CompileFail, ParseFail, Pretty, RunFail, RunPass, RunPassValgrind};
 use common::{Config, TestPaths};
-use diff;
 use errors::{self, Error, ErrorKind};
 use filetime::FileTime;
 use header::TestProps;