diff --git a/src/main/java/org/cryptomator/common/LazyProcessedProperties.java b/src/main/java/org/cryptomator/common/LazyProcessedProperties.java
index 97248035a..c4be47f11 100644
--- a/src/main/java/org/cryptomator/common/LazyProcessedProperties.java
+++ b/src/main/java/org/cryptomator/common/LazyProcessedProperties.java
@@ -29,11 +29,12 @@ public class LazyProcessedProperties extends Properties {
 
 	//Template and env _need_ to be instance variables, otherwise they might not be initialized at access time
 	private final Pattern template = Pattern.compile("@\\{(\\w+)}");
-	private final Map<String, String> env = System.getenv();
+	private final Map<String, String> env;
 	private final Properties delegate;
 
-	public LazyProcessedProperties(Properties props) {
+	public LazyProcessedProperties(Properties props, Map<String, String> systemEnvironment) {
 		this.delegate = props;
+		this.env = systemEnvironment;
 	}
 
 	@Override
@@ -56,6 +57,7 @@ public class LazyProcessedProperties extends Properties {
 		}
 	}
 
+	//visible for testing
 	String process(String value) {
 		return template.matcher(value).replaceAll(match -> //
 				switch (match.group(1)) {
diff --git a/src/main/java/org/cryptomator/launcher/Cryptomator.java b/src/main/java/org/cryptomator/launcher/Cryptomator.java
index 0985ee33e..d6bafa489 100644
--- a/src/main/java/org/cryptomator/launcher/Cryptomator.java
+++ b/src/main/java/org/cryptomator/launcher/Cryptomator.java
@@ -30,16 +30,16 @@ import java.util.concurrent.Executors;
 public class Cryptomator {
 
 	private static final long STARTUP_TIME = System.currentTimeMillis();
-	// DaggerCryptomatorComponent gets generated by Dagger.
-	// Run Maven and include target/generated-sources/annotations in your IDE.
 
 	static {
-		var lazyProcessedProps = new LazyProcessedProperties(System.getProperties());
+		var lazyProcessedProps = new LazyProcessedProperties(System.getProperties(), System.getenv());
 		System.setProperties(lazyProcessedProps);
 		CRYPTOMATOR_COMPONENT = DaggerCryptomatorComponent.factory().create(STARTUP_TIME);
 		LOG = LoggerFactory.getLogger(Cryptomator.class);
 	}
 
+	// DaggerCryptomatorComponent gets generated by Dagger.
+	// Run Maven and include target/generated-sources/annotations in your IDE.
 	private static final CryptomatorComponent CRYPTOMATOR_COMPONENT;
 	private static final Logger LOG;
 
diff --git a/src/main/java/org/cryptomator/logging/LogbackConfigurator.java b/src/main/java/org/cryptomator/logging/LogbackConfigurator.java
index 41275d073..c352f52f5 100644
--- a/src/main/java/org/cryptomator/logging/LogbackConfigurator.java
+++ b/src/main/java/org/cryptomator/logging/LogbackConfigurator.java
@@ -59,7 +59,7 @@ public class LogbackConfigurator extends ContextAwareBase implements Configurato
 	@Override
 	public ExecutionStatus configure(LoggerContext context) {
 		//we need to preprocess those, because every other class has a dependency to logging, none are initialized yet
-		var processedProps = new LazyProcessedProperties(System.getProperties());
+		var processedProps = new LazyProcessedProperties(System.getProperties(), System.getenv());
 		var useCustomCfg = Optional.ofNullable(processedProps.getProperty("logback.configurationFile")).map(s -> Files.exists(Path.of(s))).orElse(false);
 		var logDir = Optional.ofNullable(processedProps.getProperty("cryptomator.logDir")).map(Path::of).orElse(null);
 
diff --git a/src/test/java/org/cryptomator/common/LazyProcessedPropertiesTest.java b/src/test/java/org/cryptomator/common/LazyProcessedPropertiesTest.java
index 7b7e2948f..2f5be36fa 100644
--- a/src/test/java/org/cryptomator/common/LazyProcessedPropertiesTest.java
+++ b/src/test/java/org/cryptomator/common/LazyProcessedPropertiesTest.java
@@ -1,22 +1,21 @@
 package org.cryptomator.common;
 
 import org.junit.jupiter.api.Assertions;
-import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.CsvSource;
 
+import java.util.Map;
+
 public class LazyProcessedPropertiesTest {
 
 	@ParameterizedTest
-	@CsvSource(value = """
-			org.example.@{mytest1}.test, org.example.@{mytest1}.test
-			@{only*word*digits*under_score\\},@{only*words*digits*under_score\\}
-			C:\\Users\\@{appdir}\\dir, C:\\Users\\\\dir
-			@{@{appdir}},@{}
-			Longer @{appdir} text with @{appdir}., Longer  text with .
-			""")
+	@CsvSource(value = {"org.example.@{mytest1}.test, org.example.@{mytest1}.test", //
+			"@{only*words*digits*under_score\\},@{only*words*digits*under_score\\}", //
+			"C:\\Users\\@{appdir}\\dir, C:\\Users\\foobar\\dir", //
+			"@{@{appdir}},@{foobar}", //
+			"Longer @{appdir} text with @{appdir}., Longer foobar text with foobar."})
 	public void test(String propertyValue, String expected) {
-		LazyProcessedProperties inTest = new LazyProcessedProperties(System.getProperties());
+		LazyProcessedProperties inTest = new LazyProcessedProperties(System.getProperties(), Map.of("APPDIR", "foobar"));
 		var result = inTest.process(propertyValue);
 		Assertions.assertEquals(result, expected);
 	}