diff --git a/src/main/kotlin/alfred/web/system/ProcessEnvironment.kt b/src/main/kotlin/alfred/web/system/ProcessEnvironment.kt
index c0dce26..7de4ab4 100644
--- a/src/main/kotlin/alfred/web/system/ProcessEnvironment.kt
+++ b/src/main/kotlin/alfred/web/system/ProcessEnvironment.kt
@@ -19,11 +19,14 @@ class ProcessEnvironment {
         useEnv: MutableMap<String, String> = System.getenv()
     ) =
         useEnv.let { env ->
-            env.filter { it.key.contains("ALFRED") }.forEach { env.remove(it.key) }
-            env.putAll(config.env)
-            env["ALFRED_LOG_FILE"] = logFile.backingFile.absolutePath
-            env["ALFRED_REV"] = rev ?: ""
-            env
+            val newEnv = mutableMapOf<String, String>()
+            newEnv.putAll(env)
+
+            newEnv.filter { it.key.contains("ALFRED") }.forEach { env.remove(it.key) }
+            newEnv.putAll(config.env)
+            newEnv["ALFRED_LOG_FILE"] = logFile.backingFile.absolutePath
+            newEnv["ALFRED_REV"] = rev ?: ""
+            newEnv
         }
 
 }
diff --git a/src/test/kotlin/alfred/web/system/ProcessEnvironmentTest.kt b/src/test/kotlin/alfred/web/system/ProcessEnvironmentTest.kt
index bce3548..b05cb5a 100644
--- a/src/test/kotlin/alfred/web/system/ProcessEnvironmentTest.kt
+++ b/src/test/kotlin/alfred/web/system/ProcessEnvironmentTest.kt
@@ -2,7 +2,6 @@ package alfred.web.system
 
 import alfred.web.core.build.BuildConfig
 import alfred.web.core.build.LogFile
-import alfred.web.system.ProcessEnvironment
 import org.junit.jupiter.api.Test
 import java.nio.file.Files
 import kotlin.test.assertEquals