diff --git a/src/System.IO.Abstractions.TestingHelpers/MockFile.cs b/src/System.IO.Abstractions.TestingHelpers/MockFile.cs
index 81de2327f..82f5a0269 100644
--- a/src/System.IO.Abstractions.TestingHelpers/MockFile.cs
+++ b/src/System.IO.Abstractions.TestingHelpers/MockFile.cs
@@ -411,8 +411,6 @@ private Stream OpenInternal(
             var mockFileData = mockFileDataAccessor.GetFile(path);
             mockFileData.CheckFileAccess(path, access);
 
-            var length = mockFileData.Contents.Length;
-
             return new MockFileStream(mockFileDataAccessor, path, mode, access, options);
         }