diff --git a/src/Microsoft.OpenApi.Readers/OpenApiStreamReader.cs b/src/Microsoft.OpenApi.Readers/OpenApiStreamReader.cs
index 4529cb57e..8922be4ce 100644
--- a/src/Microsoft.OpenApi.Readers/OpenApiStreamReader.cs
+++ b/src/Microsoft.OpenApi.Readers/OpenApiStreamReader.cs
@@ -73,9 +73,10 @@ public async Task<ReadResult> ReadAsync(Stream input, CancellationToken cancella
                 bufferedStream.Position = 0;
             }
 
-            var reader = new StreamReader(bufferedStream);
-
-            return await new OpenApiTextReaderReader(_settings).ReadAsync(reader, cancellationToken);
+            using (var reader = new StreamReader(bufferedStream))
+            {
+                return await new OpenApiTextReaderReader(_settings).ReadAsync(reader, cancellationToken);
+            }
         }
 
         /// <summary>