diff --git a/packages/server/src/tests/utilities/TestConfiguration.ts b/packages/server/src/tests/utilities/TestConfiguration.ts
index cbcb7888aa..82704220f8 100644
--- a/packages/server/src/tests/utilities/TestConfiguration.ts
+++ b/packages/server/src/tests/utilities/TestConfiguration.ts
@@ -226,13 +226,6 @@ class TestConfiguration {
     }
 
     return () => {
-      for (const key in newEnvVars) {
-        // @ts-ignore
-        delete env[key]
-        // @ts-ignore
-        delete coreEnv[key]
-      }
-
       for (const [key, value] of Object.entries(oldEnv)) {
         env._set(key, value)
       }
diff --git a/packages/worker/src/tests/TestConfiguration.ts b/packages/worker/src/tests/TestConfiguration.ts
index 918083cf56..41a074ee89 100644
--- a/packages/worker/src/tests/TestConfiguration.ts
+++ b/packages/worker/src/tests/TestConfiguration.ts
@@ -265,13 +265,6 @@ class TestConfiguration {
     }
 
     return () => {
-      for (const key in newEnvVars) {
-        // @ts-ignore
-        delete env[key]
-        // @ts-ignore
-        delete coreEnv[key]
-      }
-
       for (const [key, value] of Object.entries(oldEnv)) {
         env._set(key, value)
       }