diff --git a/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java b/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
index ce312d01d..67e553e65 100644
--- a/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
+++ b/src/main/java/de/dhbwstuttgart/core/JavaTXCompiler.java
@@ -909,7 +909,7 @@ public class JavaTXCompiler {
 			// "/testBytecode/generatedBC/" +name+".class"));
 			File outputFile = new File(path, name.getClassName() + ".class");
 			outputFile.getAbsoluteFile().getParentFile().mkdirs();
-			output = new FileOutputStream(outputFile, false);
+			output = new FileOutputStream(outputFile);
 			output.write(bytecode);
 			output.close();
 			System.out.println(name + ".class file generated");
diff --git a/src/test/java/targetast/TestCodegen.java b/src/test/java/targetast/TestCodegen.java
index c1c2a5ee7..acfa46d9f 100644
--- a/src/test/java/targetast/TestCodegen.java
+++ b/src/test/java/targetast/TestCodegen.java
@@ -31,7 +31,7 @@ public class TestCodegen {
     private static void writeClassFile(String name, byte[] code) throws IOException {
         var path = Path.of(System.getProperty("user.dir"), "src/test/resources/target/");
         Files.createDirectories(path);
-        Files.write(path.resolve(name + ".class"), code, StandardOpenOption.CREATE);
+        Files.write(path.resolve(name + ".class"), code, StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING);
     }
 
     public static Class<?> generateClass(TargetClass clazz, IByteArrayClassLoader classLoader) throws IOException {