diff --git a/src/engine/gameManager/BuildingManager.java b/src/engine/gameManager/BuildingManager.java
index 59e6a28b..98e185e0 100644
--- a/src/engine/gameManager/BuildingManager.java
+++ b/src/engine/gameManager/BuildingManager.java
@@ -55,7 +55,7 @@ public enum BuildingManager {
 
         for (int i = 0; i < numOfSlots; i++) {
 
-            if (!building.hirelings.contains(i))
+            if (building.hirelings.get(i) != null)
                 return i;
         }
         return -1;