diff --git a/src/main/java/koz01/java2/lab10/TeachingStaff.java b/src/main/java/koz01/java2/lab10/TeachingStaff.java
index 9083e2bbbedb3644d74f1024bb3088329cbb2221..4fdfd5b324c1df4578542381e5c787eb81d2e150 100644
--- a/src/main/java/koz01/java2/lab10/TeachingStaff.java
+++ b/src/main/java/koz01/java2/lab10/TeachingStaff.java
@@ -9,6 +9,8 @@ import lombok.Setter;
 @NoArgsConstructor
 public class TeachingStaff extends Staff {
 
+	private static final long serialVersionUID = 1L;
+
 	@Getter
 	@Setter
 	private String qualification;