diff --git a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.DefaultItems.targets b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.DefaultItems.targets
index 6c54a6af19a1..f2a151a1dfdf 100644
--- a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.DefaultItems.targets
+++ b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.DefaultItems.targets
@@ -32,6 +32,7 @@ Copyright (c) .NET Foundation. All rights reserved.
     <DefaultItemExcludes>$(DefaultItemExcludes);**/*.user</DefaultItemExcludes>
     <DefaultItemExcludes>$(DefaultItemExcludes);**/*.*proj</DefaultItemExcludes>
     <DefaultItemExcludes>$(DefaultItemExcludes);**/*.sln</DefaultItemExcludes>
+    <DefaultItemExcludes>$(DefaultItemExcludes);**/*.slnx</DefaultItemExcludes>
     <DefaultItemExcludes>$(DefaultItemExcludes);**/*.vssscc</DefaultItemExcludes>
     <DefaultItemExcludes>$(DefaultItemExcludes);**/.DS_Store</DefaultItemExcludes>