diff --git a/tests/testcfg/mod.rs b/tests/testcfg/mod.rs
index 43bd7047..6083f0aa 100644
--- a/tests/testcfg/mod.rs
+++ b/tests/testcfg/mod.rs
@@ -130,7 +130,7 @@ impl TestCfg {
             .args(args)
             .current_dir(&self.home)
             .env("HOME", &self.home)
-            .env("CARGO_HOME", &self.home.join(".cargo"))
+            .env("CARGO_HOME", self.home.join(".cargo"))
             .env(
                 "PATH",
                 format!(