diff --git a/src/Microsoft.AspNetCore.Mvc.Core/PhysicalFileResult.cs b/src/Microsoft.AspNetCore.Mvc.Core/PhysicalFileResult.cs
index b756b19c16..54f1eb0387 100644
--- a/src/Microsoft.AspNetCore.Mvc.Core/PhysicalFileResult.cs
+++ b/src/Microsoft.AspNetCore.Mvc.Core/PhysicalFileResult.cs
@@ -87,7 +87,7 @@ namespace Microsoft.AspNetCore.Mvc
                 await sendFile.SendFileAsync(
                     FileName,
                     offset: 0,
-                    length: null,
+                    count: null,
                     cancellation: default(CancellationToken));
             }
             else
diff --git a/src/Microsoft.AspNetCore.Mvc.Core/VirtualFileResult.cs b/src/Microsoft.AspNetCore.Mvc.Core/VirtualFileResult.cs
index 64f7d6ff1d..457623770a 100644
--- a/src/Microsoft.AspNetCore.Mvc.Core/VirtualFileResult.cs
+++ b/src/Microsoft.AspNetCore.Mvc.Core/VirtualFileResult.cs
@@ -103,7 +103,7 @@ namespace Microsoft.AspNetCore.Mvc
                     await sendFile.SendFileAsync(
                         physicalPath,
                         offset: 0,
-                        length: null,
+                        count: null,
                         cancellation: default(CancellationToken));
                 }
                 else