diff --git a/src/main/java/edu/mostafa/abac/config/ProjectSecurityUser.java b/src/main/java/edu/mostafa/abac/config/ProjectSecurityUser.java
index 2f0822a..008cb79 100644
--- a/src/main/java/edu/mostafa/abac/config/ProjectSecurityUser.java
+++ b/src/main/java/edu/mostafa/abac/config/ProjectSecurityUser.java
@@ -10,6 +10,8 @@
 import edu.mostafa.abac.web.model.UserRole;
 
 public class ProjectSecurityUser extends User implements ProjectUser {
+	private static final long serialVersionUID = 8498233196842987555L;
+	
 	private Project project;
 	private UserRole role;