diff --git a/app/src/main/java/de/jotomo/ruffyscripter/RuffyScripter.java b/app/src/main/java/de/jotomo/ruffyscripter/RuffyScripter.java
index 086f7a8f1f..bb15347ac2 100644
--- a/app/src/main/java/de/jotomo/ruffyscripter/RuffyScripter.java
+++ b/app/src/main/java/de/jotomo/ruffyscripter/RuffyScripter.java
@@ -51,10 +51,10 @@ public class RuffyScripter {
 
     private boolean started = false;
 
-    private Object keylock = new Object();
+    private final Object keylock = new Object();
     private int keynotwait = 0;
 
-    private Object screenlock = new Object();
+    private final Object screenlock = new Object();
 
     public RuffyScripter() {