diff --git a/src/main/java/ru/micord/ervu/av/s3/S3Service.java b/src/main/java/ru/micord/ervu/av/s3/S3Service.java
index e5a3b2d..721b9dc 100644
--- a/src/main/java/ru/micord/ervu/av/s3/S3Service.java
+++ b/src/main/java/ru/micord/ervu/av/s3/S3Service.java
@@ -16,11 +16,13 @@ import ru.micord.ervu.av.exception.FileUploadException;
 public class S3Service {
   private final String outBucketName;
   private final AmazonS3 outClient;
+  private final String s3Prefix;
 
   @Autowired
   public S3Service(String outBucketName, AmazonS3 outClient) {
     this.outBucketName = outBucketName;
     this.outClient = outClient;
+    this.s3Prefix = "s3://" + outBucketName + "/";
   }
 
   @PostConstruct
@@ -33,7 +35,7 @@ public class S3Service {
   public String putFile(Path filePath, String key) throws FileUploadException {
     try {
       outClient.putObject(outBucketName, key, filePath.toFile());
-      return String.join("/", "s3:/", outBucketName, key);
+      return s3Prefix + key;
     }
     catch (AmazonServiceException e) {
       // todo message
@@ -42,11 +44,10 @@ public class S3Service {
   }
 
   public void deleteFileByUrl(String url) {
-    String prefix = "s3://" + outBucketName + "/";
-    if (!url.startsWith(prefix)) {
+    if (!url.startsWith(s3Prefix)) {
       throw new IllegalArgumentException("Некорректный S3 URL: " + url);
     }
-    String key = url.substring(prefix.length());
+    String key = url.substring(s3Prefix.length());
     outClient.deleteObject(outBucketName, key);
   }
 }