diff --git a/src/Smdn.Net.EchonetLite.Appendix/.editorconfig b/src/Smdn.Net.EchonetLite.Appendix/.editorconfig
deleted file mode 100644
index 4ba0aac..0000000
--- a/src/Smdn.Net.EchonetLite.Appendix/.editorconfig
+++ /dev/null
@@ -1,3 +0,0 @@
-[*.cs]
-dotnet_style_namespace_match_folder = true
-dotnet_diagnostic.IDE0130.severity = warning
\ No newline at end of file
diff --git a/src/Smdn.Net.EchonetLite/.editorconfig b/src/Smdn.Net.EchonetLite/.editorconfig
deleted file mode 100644
index 4ba0aac..0000000
--- a/src/Smdn.Net.EchonetLite/.editorconfig
+++ /dev/null
@@ -1,3 +0,0 @@
-[*.cs]
-dotnet_style_namespace_match_folder = true
-dotnet_diagnostic.IDE0130.severity = warning
\ No newline at end of file