diff --git a/.global.editorconfig.ini b/.global.editorconfig.ini
index b1e3a37dce..c10d5cdcd1 100644
--- a/.global.editorconfig.ini
+++ b/.global.editorconfig.ini
@@ -1,5 +1,8 @@
 is_global = true
 
+# Obsolete member 'memberA' overrides non-obsolete member 'memberB' (this simply doesn't work, see https://learn.microsoft.com/en-us/dotnet/csharp/misc/cs0809#methods-recognized-as-obsolete)
+dotnet_diagnostic.CS0809.severity = error
+
 ## BizHawk internal rules
 
 # Do not use anonymous delegates