diff --git a/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/intimpl/MkvFileCollector.java b/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/intimpl/MkvFileCollector.java
index f1b6065..59bb0f9 100644
--- a/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/intimpl/MkvFileCollector.java
+++ b/src/main/java/at/pcgamingfreaks/mkvaudiosubtitlechanger/intimpl/MkvFileCollector.java
@@ -19,7 +19,7 @@ import java.util.stream.Stream;
 
 @Log4j2
 public class MkvFileCollector implements FileCollector {
-    private ObjectMapper mapper = new ObjectMapper();
+    private final ObjectMapper mapper = new ObjectMapper();
 
     /**
      * @param path Is entered path, which leads to one file directly or a directory which will be loaded recursive
@@ -79,8 +79,4 @@ public class MkvFileCollector implements FileCollector {
         }
         return fileAttributes;
     }
-
-    private boolean verifyFile(File file) {
-        return false;
-    }
 }