diff --git a/src/main/java/org/parabot/environment/api/utils/Timer.java b/src/main/java/org/parabot/environment/api/utils/Timer.java
index 5b44fdc..5a457cf 100644
--- a/src/main/java/org/parabot/environment/api/utils/Timer.java
+++ b/src/main/java/org/parabot/environment/api/utils/Timer.java
@@ -115,7 +115,7 @@ public class Timer {
      * @param startAmount   start amount
      * @return              hourly gains
      */
-    public int getPerHour(final int gained, int startAmount) {
+    public int getPerHour(final int gained, final int startAmount) {
         return (int) (((gained - startAmount) * 3600000D) / (System.currentTimeMillis() - start));
     }