diff --git a/src/Microsoft.AspNetCore.ResponseCaching/Internal/ResponseCacheStream.cs b/src/Microsoft.AspNetCore.ResponseCaching/Internal/ResponseCacheStream.cs
index 989e7aa..b8921b8 100644
--- a/src/Microsoft.AspNetCore.ResponseCaching/Internal/ResponseCacheStream.cs
+++ b/src/Microsoft.AspNetCore.ResponseCaching/Internal/ResponseCacheStream.cs
@@ -40,6 +40,8 @@ public override long Position
         public void DisableBuffering()
         {
             BufferingEnabled = false;
+            BufferedStream.SetLength(0);
+            BufferedStream.Capacity = 0;
             BufferedStream.Dispose();
         }