diff --git a/backend/test/backend/real_server_tests.hpp b/backend/test/backend/real_server_tests.hpp
index 7b9c939a..c68affe1 100644
--- a/backend/test/backend/real_server_tests.hpp
+++ b/backend/test/backend/real_server_tests.hpp
@@ -61,7 +61,7 @@ class RealServerTests : public ::testing::Test
   protected:
     void SetUp() override
     {
-        std::ofstream privateKeyFile{temporaryRoot / "key.private", std::ios_base::binary};
+        std::ofstream privateKeyFile{isolateDirectory_.path() / "key.private", std::ios_base::binary};
         privateKeyFile.write(privateKey, std::strlen(privateKey));
     }
 
@@ -140,7 +140,8 @@ class RealServerTests : public ::testing::Test
     }
 
   protected:
-    Utility::TemporaryDirectory isolateDirectory_{temporaryRoot, false};
+    /** @brief The test's own directory for its server, removed with the test. temporaryRoot outlives every test. */
+    Utility::TemporaryDirectory isolateDirectory_{temporaryRoot};
     boost::asio::thread_pool pool_{1};
     nlohmann::json defaultPackageJson_ = nlohmann::json({
         {"name", "test"},
diff --git a/backend/test/backend/test_existence_check.hpp b/backend/test/backend/test_existence_check.hpp
index 5f6d1247..d27def1a 100644
--- a/backend/test/backend/test_existence_check.hpp
+++ b/backend/test/backend/test_existence_check.hpp
@@ -32,7 +32,7 @@ namespace Test
             return Paths::nativeToUtf8(root_.path() / relative);
         }
 
-        Utility::TemporaryDirectory root_{temporaryRoot, false};
+        Utility::TemporaryDirectory root_{temporaryRoot};
     };
 
     TEST_F(ExistenceCheckTests, LocalMissingPathIsAbsentAndExistingPathsExist)