diff --git a/src/backend/Agent.java b/src/backend/Agent.java
index 00d199f..bc71b36 100644
--- a/src/backend/Agent.java
+++ b/src/backend/Agent.java
@@ -34,7 +34,7 @@ public abstract class Agent {
 	// then returns a boolean
 	// if false, agent dies at end of turn
 	// see step function in Simulator
-	public abstract boolean liveTurn(ArrayList<Agent> neighbors, World world);
+	public abstract boolean liveTurn(ArrayList<Agent> neighbors, Simulator world);
 
 
 }
diff --git a/src/backend/Sheep.java b/src/backend/Sheep.java
index 0317fab..ac53a2d 100644
--- a/src/backend/Sheep.java
+++ b/src/backend/Sheep.java
@@ -29,7 +29,7 @@ public class Sheep extends Agent {
 	 * it can interact with the cells or with other animals
 	 * as you wish
 	 */
-	public boolean liveTurn(ArrayList<Agent> neighbors, World world) {
+	public boolean liveTurn(ArrayList<Agent> neighbors, Simulator world) {
 		if(world.getCell(x, y)==1) {
 			world.setCell(x, y, 0);
 		} else {
diff --git a/src/backend/Wolf.java b/src/backend/Wolf.java
index 4288bdb..584f4b0 100644
--- a/src/backend/Wolf.java
+++ b/src/backend/Wolf.java
@@ -25,7 +25,7 @@ public class Wolf extends Agent {
 	 * it can interact with the cells or with other animals
 	 * as you wish
 	 */
-	public boolean liveTurn(ArrayList<Agent> neighbors, World world) {
+	public boolean liveTurn(ArrayList<Agent> neighbors, Simulator world) {
 		if(world.getCell(x, y)==1) {
 			world.setCell(x, y, 0);
 		} else {