diff --git a/README.md b/README.md
index c21d2ee..9113b22 100644
--- a/README.md
+++ b/README.md
@@ -190,7 +190,7 @@ resp = client.post(url="https://httpbin.org/anything", json=json)
 print(r.text)
 
 # POST Multipart-Encoded Files
-files = {'file1': open('file1.txt', 'rb').read(), 'file2': open('file2.txt', 'rb').read()}
+files = {'file1': open('file1.txt'), 'file2': open('file2.txt')}
 r = client.post("https://httpbin.org/post", files=files)
 print(r.text)
 
diff --git a/src/lib.rs b/src/lib.rs
index 162efdb..fe125cb 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -376,9 +376,8 @@ impl Client {
                 // Files
                 if let Some(files) = files {
                     let mut form = multipart::Form::new();
-                    for (file_name, file_content) in files {
-                        let part =
-                            multipart::Part::bytes(file_content).file_name(file_name.clone());
+                    for (file_name, file_buf) in files {
+                        let part = multipart::Part::stream(file_buf).file_name(file_name.clone());
                         form = form.part(file_name, part);
                     }
                     request_builder = request_builder.multipart(form);