diff --git a/lab3/zad2/app/src/main/java/pl/jacekpoz/DHSetup.java b/lab3/zad2/app/src/main/java/pl/jacekpoz/DHSetup.java
index 7139f68..a65497f 100644
--- a/lab3/zad2/app/src/main/java/pl/jacekpoz/DHSetup.java
+++ b/lab3/zad2/app/src/main/java/pl/jacekpoz/DHSetup.java
@@ -72,7 +72,7 @@ public class DHSetup<T extends IGF> implements IDHSetup<T> {
      * raises `a` to the power of `b`
      */
     @Override
-    public T power(T a, long b) {
+    public T power(final T a, long b) {
         T aCopy = this.constructor.apply(new GF.Params(a.getCharacteristic(), a.getValue()));
         T res = this.constructor.apply(new GF.Params(a.getCharacteristic(), a.getValue()));
         while (b > 0) {
diff --git a/lab3/zad2/app/src/main/java/pl/jacekpoz/IDHSetup.java b/lab3/zad2/app/src/main/java/pl/jacekpoz/IDHSetup.java
index 3974414..63834fd 100644
--- a/lab3/zad2/app/src/main/java/pl/jacekpoz/IDHSetup.java
+++ b/lab3/zad2/app/src/main/java/pl/jacekpoz/IDHSetup.java
@@ -10,5 +10,5 @@ public interface IDHSetup<T> {
     /*
      * raises `a` to the power of `b`
      */
-    public T power(T a, long b);
+    public T power(final T a, long b);
 }