diff --git a/F-Droid/src/com/google/zxing/encode/QRCodeEncoder.java b/F-Droid/src/com/google/zxing/encode/QRCodeEncoder.java
index fe2ba9e47..6200701f6 100755
--- a/F-Droid/src/com/google/zxing/encode/QRCodeEncoder.java
+++ b/F-Droid/src/com/google/zxing/encode/QRCodeEncoder.java
@@ -42,7 +42,7 @@ public final class QRCodeEncoder {
     private String displayContents;
     private String title;
     private BarcodeFormat format;
-    private boolean encoded;
+    private final boolean encoded;
 
     public QRCodeEncoder(String data, Bundle bundle, String type, String format, int dimension) {
         this.dimension = dimension;
diff --git a/F-Droid/src/org/fdroid/fdroid/AppDetails.java b/F-Droid/src/org/fdroid/fdroid/AppDetails.java
index 29f4995d1..94ce0b15f 100644
--- a/F-Droid/src/org/fdroid/fdroid/AppDetails.java
+++ b/F-Droid/src/org/fdroid/fdroid/AppDetails.java
@@ -1133,7 +1133,7 @@ public class AppDetails extends AppCompatActivity implements ProgressListener, A
         }
 
         private ViewGroup layoutLinksContent;
-        private View.OnClickListener expanderLinks = new View.OnClickListener() {
+        private final View.OnClickListener expanderLinks = new View.OnClickListener() {
             @Override
             public void onClick(View v) {
 
diff --git a/F-Droid/src/org/fdroid/fdroid/localrepo/LocalRepoManager.java b/F-Droid/src/org/fdroid/fdroid/localrepo/LocalRepoManager.java
index 7a9bc8f31..85037e049 100644
--- a/F-Droid/src/org/fdroid/fdroid/localrepo/LocalRepoManager.java
+++ b/F-Droid/src/org/fdroid/fdroid/localrepo/LocalRepoManager.java
@@ -82,8 +82,8 @@ public final class LocalRepoManager {
     private final Map<String, App> apps = new HashMap<>();
 
     public final SanitizedFile xmlIndex;
-    private SanitizedFile xmlIndexJar;
-    private SanitizedFile xmlIndexJarUnsigned;
+    private final SanitizedFile xmlIndexJar;
+    private final SanitizedFile xmlIndexJarUnsigned;
     public final SanitizedFile webRoot;
     public final SanitizedFile fdroidDir;
     public final SanitizedFile fdroidDirCaps;