diff --git a/backend/src/main/java/org/raddatz/familienarchiv/document/Document.java b/backend/src/main/java/org/raddatz/familienarchiv/document/Document.java
index 7a6adba2..d98165d2 100644
--- a/backend/src/main/java/org/raddatz/familienarchiv/document/Document.java
+++ b/backend/src/main/java/org/raddatz/familienarchiv/document/Document.java
@@ -136,6 +136,7 @@ public class Document {
 
     @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "sender_id")
+    @BatchSize(size = 50)
     private Person sender;
 
     @ManyToMany(fetch = FetchType.LAZY)
@@ -148,6 +149,7 @@ public class Document {
     @CollectionTable(name = "document_training_labels", joinColumns = @JoinColumn(name = "document_id"))
     @Column(name = "label")
     @Enumerated(EnumType.STRING)
+    @BatchSize(size = 50)
     @Builder.Default
     private Set<TrainingLabel> trainingLabels = new HashSet<>();