diff --git a/src/main/java/eu/eudat/depositinterface/zenodorepository/interfaces/ZenodoDeposit.java b/src/main/java/eu/eudat/depositinterface/zenodorepository/interfaces/ZenodoDeposit.java
index 536f2f6..15550a3 100644
--- a/src/main/java/eu/eudat/depositinterface/zenodorepository/interfaces/ZenodoDeposit.java
+++ b/src/main/java/eu/eudat/depositinterface/zenodorepository/interfaces/ZenodoDeposit.java
@@ -129,7 +129,9 @@ public class ZenodoDeposit implements RepositoryDeposit {
                     // Second step, add the file to the entry.
                     FileEnvelope pdfEnvelope = dmpDepositModel.getPdfFile();
                     FileSystemResource fileSystemResource = new FileSystemResource(pdfEnvelope.getFile());
-                    HttpEntity<FileSystemResource> addFileMapRequest = new HttpEntity<>(fileSystemResource, null);
+                    HttpHeaders fileHeaders = new HttpHeaders();
+                    fileHeaders.setContentType(MediaType.APPLICATION_OCTET_STREAM);
+                    HttpEntity<FileSystemResource> addFileMapRequest = new HttpEntity<>(fileSystemResource, fileHeaders);
 
                     String addFileUrl = links.get("bucket") + "/" + pdfEnvelope.getFilename() + "?access_token=" + zenodoToken;
                     restTemplate.put(addFileUrl, addFileMapRequest);