diff --git a/src/JsonApiDotNetCore/Middleware/JsonApiMiddleware.cs b/src/JsonApiDotNetCore/Middleware/JsonApiMiddleware.cs
index 03d697e7bb..8aaa401dca 100644
--- a/src/JsonApiDotNetCore/Middleware/JsonApiMiddleware.cs
+++ b/src/JsonApiDotNetCore/Middleware/JsonApiMiddleware.cs
@@ -146,7 +146,7 @@ private static async Task FlushResponseAsync(HttpResponse httpResponse, JsonSeri
                 await stream.CopyToAsync(httpResponse.Body);
             }
 
-            httpResponse.Body.Flush();
+            await httpResponse.Body.FlushAsync();
         }
 
         private static void SetupCurrentRequest(ICurrentRequest currentRequest, ResourceContext resourceContext,