diff --git a/backend/src/main/java/edu/zut/bookrider/dto/UserProfileDTO.java b/backend/src/main/java/edu/zut/bookrider/dto/UserProfileDTO.java
index 908554af..3663dbda 100644
--- a/backend/src/main/java/edu/zut/bookrider/dto/UserProfileDTO.java
+++ b/backend/src/main/java/edu/zut/bookrider/dto/UserProfileDTO.java
@@ -15,6 +15,7 @@ public class UserProfileDTO {
     private String email;
     private String firstName;
     private String lastName;
+    private Integer libraryId;
     private BigDecimal balance;
     private LocalDateTime createdAt;
 }
diff --git a/backend/src/main/java/edu/zut/bookrider/service/UserService.java b/backend/src/main/java/edu/zut/bookrider/service/UserService.java
index 4c5a97b6..60052229 100644
--- a/backend/src/main/java/edu/zut/bookrider/service/UserService.java
+++ b/backend/src/main/java/edu/zut/bookrider/service/UserService.java
@@ -129,6 +129,7 @@ public UserProfileDTO getUserProfile() {
                 user.getEmail(),
                 user.getFirstName(),
                 user.getLastName(),
+                user.getLibrary() != null ? user.getLibrary().getId() : null,
                 user.getBalance(),
                 user.getCreatedAt()
         );