diff --git a/pkgs/cupertino_http/CHANGELOG.md b/pkgs/cupertino_http/CHANGELOG.md
index 4667f6ab1f..989b18ab45 100644
--- a/pkgs/cupertino_http/CHANGELOG.md
+++ b/pkgs/cupertino_http/CHANGELOG.md
@@ -1,4 +1,7 @@
-## 1.5.2-wip
+## 2.0.0-wip
+
+* MutableURLRequest.httpBodyStream now takes a `NSInputStream` instead of a
+  `Stream<List<int>>`.
 
 ## 1.5.1
 
diff --git a/pkgs/cupertino_http/lib/src/cupertino_api.dart b/pkgs/cupertino_http/lib/src/cupertino_api.dart
index 771a245475..e2af108c70 100644
--- a/pkgs/cupertino_http/lib/src/cupertino_api.dart
+++ b/pkgs/cupertino_http/lib/src/cupertino_api.dart
@@ -62,9 +62,6 @@ abstract class _ObjectHolder<T extends objc.NSObject> {
   int get hashCode => _nsObject.hashCode;
 }
 
-objc.NSInputStream _streamToNSInputStream(Stream<List<int>> stream) =>
-    stream.toNSInputStream();
-
 /// A cache for [URLRequest]s. Used by [URLSessionConfiguration.cache].
 ///
 /// See [NSURLCache](https://developer.apple.com/documentation/foundation/nsurlcache)
@@ -755,8 +752,8 @@ class MutableURLRequest extends URLRequest {
   /// Sets the body of the request to the given [Stream].
   ///
   /// See [NSMutableURLRequest.HTTPBodyStream](https://developer.apple.com/documentation/foundation/nsurlrequest/1407341-httpbodystream).
-  set httpBodyStream(Stream<List<int>> stream) {
-    _mutableUrlRequest.HTTPBodyStream = _streamToNSInputStream(stream);
+  set httpBodyStream(objc.NSInputStream stream) {
+    _mutableUrlRequest.HTTPBodyStream = stream;
   }
 
   set httpMethod(String method) {
diff --git a/pkgs/cupertino_http/lib/src/cupertino_client.dart b/pkgs/cupertino_http/lib/src/cupertino_client.dart
index 0915144d1f..041f7f584c 100644
--- a/pkgs/cupertino_http/lib/src/cupertino_client.dart
+++ b/pkgs/cupertino_http/lib/src/cupertino_client.dart
@@ -327,10 +327,10 @@ class CupertinoClient extends BaseClient {
       // then setting `httpBodyStream` will cause the request to fail -
       // even if the stream is empty.
       if (profile == null) {
-        urlRequest.httpBodyStream = s;
+        urlRequest.httpBodyStream = s.toNSInputStream();
       } else {
         final splitter = StreamSplitter(s);
-        urlRequest.httpBodyStream = splitter.split();
+        urlRequest.httpBodyStream = splitter.split().toNSInputStream();
         unawaited(profile.requestData.bodySink.addStream(splitter.split()));
       }
     }