diff --git a/tests/compile-test.rs b/tests/compile-test.rs
index 84ac935a2011..de2cf6d7873f 100644
--- a/tests/compile-test.rs
+++ b/tests/compile-test.rs
@@ -37,7 +37,6 @@ fn clippy_driver_path() -> PathBuf {
 //        Because it would force-rebuild if the options passed to `build` command is not the same
 //        as what we manually pass to `cargo` invocation
 fn third_party_crates() -> String {
-    use std::collections::hash_map::Entry::Vacant;
     use std::collections::HashMap;
     static CRATES: &[&str] = &["serde", "serde_derive", "regex", "clippy_lints"];
     let dep_dir = cargo::TARGET_LIB.join("deps");