diff --git a/src/main/java/gov/cabinetoffice/gap/applybackend/service/ZipService.java b/src/main/java/gov/cabinetoffice/gap/applybackend/service/ZipService.java
index dc78042..8e26ed9 100644
--- a/src/main/java/gov/cabinetoffice/gap/applybackend/service/ZipService.java
+++ b/src/main/java/gov/cabinetoffice/gap/applybackend/service/ZipService.java
@@ -3,6 +3,7 @@
 import com.amazonaws.AmazonServiceException;
 import com.amazonaws.services.s3.AmazonS3;
 import com.amazonaws.services.s3.model.*;
+import gov.cabinetoffice.gap.applybackend.config.properties.S3ConfigProperties;
 import gov.cabinetoffice.gap.applybackend.model.Submission;
 import gov.cabinetoffice.gap.applybackend.config.S3Config;
 import gov.cabinetoffice.gap.applybackend.utils.ZipHelper;
@@ -25,8 +26,7 @@
 @Service
 public class ZipService {
 
-    @Value("${aws.bucket}")
-    private String s3Bucket;
+    private final S3ConfigProperties s3Properties;
 
     private static final Logger logger = LoggerFactory.getLogger(ZipService.class);
 
@@ -67,7 +67,7 @@ public ByteArrayOutputStream createSubmissionZip(final Submission submission, fi
 
     public List<String> getSubmissionAttachmentFileNames(final String applicationId,
                                                           final String submissionId) {
-        final ListObjectsV2Request req = new ListObjectsV2Request().withBucketName(s3Bucket)
+        final ListObjectsV2Request req = new ListObjectsV2Request().withBucketName(s3Properties.getBucket())
                 .withPrefix(applicationId + "/" + submissionId);
         final ListObjectsV2Result listing = client.listObjectsV2(req);
         final List<S3ObjectSummary> objectSummaries = listing.getObjectSummaries();
@@ -93,9 +93,9 @@ private List<S3ObjectSummary> getAllFromPrefix(final List<S3ObjectSummary> objec
 
     private void downloadFile(final String fileName, List<S3Object> list) {
         try {
-            list.add(client.getObject(new GetObjectRequest(s3Bucket, fileName)));
+            list.add(client.getObject(new GetObjectRequest(s3Properties.getBucket(), fileName)));
         } catch (AmazonServiceException e) {
-            logger.error("Could not download file: " + fileName + " from bucket: " + s3Bucket,
+            logger.error("Could not download file: " + fileName + " from bucket: " + s3Properties.getBucket(),
                     e);
             throw e;
         }
diff --git a/src/test/java/gov/cabinetoffice/gap/applybackend/service/ZipServiceTest.java b/src/test/java/gov/cabinetoffice/gap/applybackend/service/ZipServiceTest.java
index d942a1b..1e37460 100644
--- a/src/test/java/gov/cabinetoffice/gap/applybackend/service/ZipServiceTest.java
+++ b/src/test/java/gov/cabinetoffice/gap/applybackend/service/ZipServiceTest.java
@@ -2,10 +2,12 @@
 
 import com.amazonaws.services.s3.AmazonS3;
 import com.amazonaws.services.s3.model.*;
+import gov.cabinetoffice.gap.applybackend.config.properties.S3ConfigProperties;
 import gov.cabinetoffice.gap.applybackend.model.*;
 import org.junit.jupiter.api.*;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.InjectMocks;
+import org.mockito.Mock;
 import org.mockito.Mockito;
 import org.mockito.junit.jupiter.MockitoExtension;
 import org.odftoolkit.odfdom.doc.OdfTextDocument;
@@ -26,9 +28,12 @@ public class ZipServiceTest {
     @InjectMocks
     private ZipService serviceUnderTest;
 
+    @Mock
+    private S3ConfigProperties mockS3ConfigProperties;
+
     @BeforeEach
     void beforeEach() {
-        ReflectionTestUtils.setField(serviceUnderTest, "s3Bucket", "mockedValue");
+        Mockito.lenient().when(mockS3ConfigProperties.getBucket()).thenReturn("mockedValue");
         AmazonS3 s3Client = mock(AmazonS3.class);
         S3Object s3Obj = mock(S3Object.class);
         Mockito.lenient().when(s3Obj.getKey()).thenReturn("mockKey");