diff --git a/.editorconfig b/.editorconfig
index 8063d21863..b551b3a105 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -801,6 +801,9 @@ dotnet_diagnostic.CA2016.severity = warning
 # The 'count' argument to Buffer.BlockCopy should specify the number of bytes to copy.
 dotnet_diagnostic.CA2018.severity = warning
 
+# ThreadStatic fields should not use inline initialization.
+dotnet_diagnostic.CA2019.severity = warning
+
 ### Security Rules
 ### https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/security-warnings
 
diff --git a/OpenRA.Mods.Common/AudioLoaders/OggLoader.cs b/OpenRA.Mods.Common/AudioLoaders/OggLoader.cs
index 33b3d00089..ec60bfbaee 100644
--- a/OpenRA.Mods.Common/AudioLoaders/OggLoader.cs
+++ b/OpenRA.Mods.Common/AudioLoaders/OggLoader.cs
@@ -78,7 +78,7 @@ namespace OpenRA.Mods.Common.AudioLoaders
 
 			// This buffer can be static because it can only be used by 1 instance per thread.
 			[ThreadStatic]
-			static float[] conversionBuffer = null;
+			static float[] conversionBuffer;
 
 			public OggStream(OggFormat format)
 			{