diff --git a/persistence-service-v1/persistence-service-processor-v1/src/main/java/com/iqser/red/service/persistence/management/v1/processor/migration/migrations/MissingFileSizeMigration13.java b/persistence-service-v1/persistence-service-processor-v1/src/main/java/com/iqser/red/service/persistence/management/v1/processor/migration/migrations/MissingFileSizeMigration13.java
new file mode 100644
index 000000000..383cb0194
--- /dev/null
+++ b/persistence-service-v1/persistence-service-processor-v1/src/main/java/com/iqser/red/service/persistence/management/v1/processor/migration/migrations/MissingFileSizeMigration13.java
@@ -0,0 +1,60 @@
+package com.iqser.red.service.persistence.management.v1.processor.migration.migrations;
+
+
+import com.iqser.red.service.persistence.management.v1.processor.entity.dossier.FileEntity;
+import com.iqser.red.service.persistence.management.v1.processor.migration.Migration;
+import com.iqser.red.service.persistence.management.v1.processor.service.FileManagementStorageService;
+import com.iqser.red.service.persistence.management.v1.processor.service.persistence.FileStatusPersistenceService;
+import com.iqser.red.service.persistence.service.v1.api.shared.model.dossiertemplate.dossier.file.FileType;
+import lombok.Setter;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Slf4j
+@Setter
+@Service
+public class MissingFileSizeMigration13 extends Migration {
+
+    private static final String NAME = "Add missing file sizes";
+    private static final long VERSION = 13;
+
+    @Autowired
+    private FileStatusPersistenceService fileStatusPersistenceService;
+
+    @Autowired
+    private FileManagementStorageService fileManagementStorageService;
+
+
+    public MissingFileSizeMigration13() {
+
+        super(NAME, VERSION);
+    }
+
+
+    @Override
+    protected void migrate() {
+
+        List<FileEntity> missingFileSizeFiles = fileStatusPersistenceService.getAllFiles().stream().filter(file -> file.getFileSize() == null).toList();
+
+        log.info("Number of files without fileSize: {}", missingFileSizeFiles.size());
+
+        missingFileSizeFiles.forEach(file -> {
+            // not hard deleted
+            if (file.getHardDeletedTime() == null) {
+                try {
+                    var originFile = fileManagementStorageService.getStoredObjectBytes(file.getDossierId(), file.getId(), FileType.ORIGIN);
+                    fileStatusPersistenceService.updateFileSize(file.getId(), originFile.length);
+                } catch (Exception e) {
+                    log.warn("Failed to load file bytes for file: {} in dossier {}. Error message: {}, setting filesize to 0", file.getId(), file.getDossierId(), e.getMessage());
+                    fileStatusPersistenceService.updateFileSize(file.getId(), 0);
+                }
+            } else {
+                fileStatusPersistenceService.updateFileSize(file.getId(), 0);
+            }
+        });
+    }
+
+}