diff --git a/fastapi_storages/s3.py b/fastapi_storages/s3.py
index a9b760f..d8dc064 100644
--- a/fastapi_storages/s3.py
+++ b/fastapi_storages/s3.py
@@ -111,7 +111,7 @@ def write(self, file: BinaryIO, name: str) -> str:
         file.seek(0, 0)
         key = self.get_name(name)
 
-        self._bucket.upload_fileobj(file, key, ExtraArgs={"ACL": self.AWS_DEFAULT_ACL})
+        self._bucket.upload_fileobj(file, key, ExtraArgs={"ACL": self.AWS_DEFAULT_ACL, "ContentType": "image/png"})
         return key
 
     def generate_new_filename(self, filename: str) -> str: