diff --git a/.editorconfig b/.editorconfig
index 91d8440c0b..84e4c67134 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -63,7 +63,7 @@ dotnet_naming_rule.non_field_members_should_be_pascal_case.severity = warning
 dotnet_naming_rule.non_field_members_should_be_pascal_case.symbols = non_field_members
 dotnet_naming_rule.non_field_members_should_be_pascal_case.style = pascal_case
 
-# IDE1006, IDE-only counterpart of StyleCopAnalyzers - SA1311: StaticReadonlyFieldsMustBeginWithUpperCaseLetter.
+# IDE1006, IDE-only counterpart of StyleCopAnalyzers - SA1311: StaticReadonlyFieldsMustBeginWithUpperCaseLetter (silenced in OpenRA.ruleset).
 dotnet_naming_rule.static_private_or_internal_field_should_be_pascal_case.severity = none
 dotnet_naming_rule.static_private_or_internal_field_should_be_pascal_case.symbols = static_private_or_internal_field
 dotnet_naming_rule.static_private_or_internal_field_should_be_pascal_case.style = pascal_case
@@ -124,6 +124,9 @@ dotnet_diagnostic.IDE0036.severity = warning
 # Raise a warning on build when default access modifiers are explicitly specified.
 dotnet_diagnostic.IDE0040.severity = warning
 
+# Make field readonly.
+dotnet_diagnostic.IDE0044.severity = warning
+
 # Avoid unnecessary zero-length array allocations.
 dotnet_diagnostic.CA1825.severity = warning
 
diff --git a/OpenRA.ruleset b/OpenRA.ruleset
index 10d9441655..e364edaacf 100644
--- a/OpenRA.ruleset
+++ b/OpenRA.ruleset
@@ -55,6 +55,7 @@
     <Rule Id="SA1132" Action="None" /><!-- DoNotCombineFields -->
     <Rule Id="SA1204" Action="None" /><!-- StaticElementsMustAppearBeforeInstanceElements -->
     <Rule Id="SA1214" Action="None" /><!-- ReadonlyElementsMustAppearBeforeNonReadonlyElements -->
+    <Rule Id="SA1311" Action="None" /><!-- StaticReadonlyFieldsMustBeginWithUpperCaseLetter - silenced to match IDE1006 in .editorconfig -->
     <Rule Id="SA1413" Action="None" /><!-- UseTrailingCommasInMultiLineInitializers -->
     <Rule Id="SA1516" Action="None" /><!-- ElementsMustBeSeparatedByBlankLine -->
     <Rule Id="SA1604" Action="None" /><!-- ElementDocumentationShouldHaveSummary -->
@@ -65,4 +66,4 @@
     <Rule Id="SA1629" Action="None" /><!-- DocumentationTextShouldEndWithAPeriod -->
     <Rule Id="SA1642" Action="None" /><!-- ConstructorSummaryDocumentationShouldBeginWithStandardText -->
   </Rules>
-</RuleSet>
\ No newline at end of file
+</RuleSet>