diff --git a/src/jrummikub/control/AIUtil.java b/src/jrummikub/control/AIUtil.java
index 393aa95..92412b2 100644
--- a/src/jrummikub/control/AIUtil.java
+++ b/src/jrummikub/control/AIUtil.java
@@ -263,7 +263,7 @@ public class AIUtil {
 		return result;
 	}
 
-	static void incrementStoneCount(
+	private static void incrementStoneCount(
 			TreeMap<Pair<Integer, StoneColor>, Integer> stones,
 			Pair<Integer, StoneColor> stone) {
 		if (stones.containsKey(stone)) {
@@ -273,7 +273,7 @@ public class AIUtil {
 		}
 	}
 
-	static void decrementStoneCount(
+	private static void decrementStoneCount(
 			TreeMap<Pair<Integer, StoneColor>, Integer> stones,
 			Pair<Integer, StoneColor> stone) {
 		int count = stones.get(stone);
@@ -286,7 +286,7 @@ public class AIUtil {
 		}
 	}
 
-	StoneColor getNextColor(StoneColor color) {
+	private StoneColor getNextColor(StoneColor color) {
 		int index = stoneColors.indexOf(color) + 1;
 		if (index >= stoneColors.size()) {
 			return null;