diff --git a/src/Microsoft.OpenApi.Readers/OpenApiStreamReader.cs b/src/Microsoft.OpenApi.Readers/OpenApiStreamReader.cs
index d1515bc56..ae01833fb 100644
--- a/src/Microsoft.OpenApi.Readers/OpenApiStreamReader.cs
+++ b/src/Microsoft.OpenApi.Readers/OpenApiStreamReader.cs
@@ -73,7 +73,7 @@ public async Task<ReadResult> ReadAsync(Stream input, CancellationToken cancella
                 bufferedStream.Position = 0;
             }
 
-            using var reader = new StreamReader(bufferedStream, default, true, -1, leaveOpen: _settings.LeaveStreamOpen);
+            using var reader = new StreamReader(bufferedStream, default, true, -1, _settings.LeaveStreamOpen);
             return await new OpenApiTextReaderReader(_settings).ReadAsync(reader, cancellationToken);
         }