diff --git a/.editorconfig b/.editorconfig
index 95b58d8c7e..9459379a4b 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -255,4 +255,7 @@ csharp_space_between_square_brackets = false
 
 # Primary constructors
 # We find these something of a mixed bag.
-dotnet_diagnostic.IDE0290.severity = none
\ No newline at end of file
+dotnet_diagnostic.IDE0290.severity = none
+
+# Namespace style.
+csharp_style_namespace_declarations = block_scoped
\ No newline at end of file