diff --git a/summer2024-backend/src/main/java/fr/kektus/summer2024/domain/service/AssetService.java b/summer2024-backend/src/main/java/fr/kektus/summer2024/domain/service/AssetService.java
index 2889265..342d2e5 100644
--- a/summer2024-backend/src/main/java/fr/kektus/summer2024/domain/service/AssetService.java
+++ b/summer2024-backend/src/main/java/fr/kektus/summer2024/domain/service/AssetService.java
@@ -35,6 +35,7 @@ public class AssetService {
         String actualFilename = UUID.randomUUID() + "_" + filename;
         PostPolicy policy = new PostPolicy(bucketName, ZonedDateTime.now().plusMinutes(60));
         policy.addEqualsCondition("key", actualFilename);
+        policy.addStartsWithCondition("Content-Type", "");
         policy.addContentLengthRangeCondition(64 * 1024, 200 * 1024 * 1024);
         try {
             Map<String, String> formData = minioClient.getPresignedPostFormData(policy);