diff --git a/.editorconfig b/.editorconfig
index 2b81b39a30..520a799f94 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -171,6 +171,9 @@ dotnet_diagnostic.IDE0036.severity = warning
 # Raise a warning on build when default access modifiers are explicitly specified.
 dotnet_diagnostic.IDE0040.severity = warning
 
+# Use 'is null' check.
+dotnet_diagnostic.IDE0041.severity = warning
+
 # Make field readonly.
 dotnet_diagnostic.IDE0044.severity = warning
 
diff --git a/OpenRA.Mods.Common/Traits/World/EditorActorPreview.cs b/OpenRA.Mods.Common/Traits/World/EditorActorPreview.cs
index d0ecbad012..213c46d6e5 100644
--- a/OpenRA.Mods.Common/Traits/World/EditorActorPreview.cs
+++ b/OpenRA.Mods.Common/Traits/World/EditorActorPreview.cs
@@ -274,7 +274,7 @@ namespace OpenRA.Mods.Common.Traits
 
 		public bool Equals(EditorActorPreview other)
 		{
-			if (ReferenceEquals(null, other))
+			if (other is null)
 				return false;
 			if (ReferenceEquals(this, other))
 				return true;
@@ -284,7 +284,7 @@ namespace OpenRA.Mods.Common.Traits
 
 		public override bool Equals(object obj)
 		{
-			if (ReferenceEquals(null, obj))
+			if (obj is null)
 				return false;
 			if (ReferenceEquals(this, obj))
 				return true;