diff --git a/OpenRA.Mods.Common/Lint/CheckChromeHotkeys.cs b/OpenRA.Mods.Common/Lint/CheckChromeHotkeys.cs
index 0f2ae827b7..54524b4fd8 100644
--- a/OpenRA.Mods.Common/Lint/CheckChromeHotkeys.cs
+++ b/OpenRA.Mods.Common/Lint/CheckChromeHotkeys.cs
@@ -64,7 +64,7 @@ namespace OpenRA.Mods.Common.Lint
 			}
 		}
 
-		void CheckInner(ModData modData, string[] namedKeys, (string Widget, string Field)[] checkWidgetFields, Dictionary<string, List<string>> customLintMethods,
+		static void CheckInner(ModData modData, string[] namedKeys, (string Widget, string Field)[] checkWidgetFields, Dictionary<string, List<string>> customLintMethods,
 			IEnumerable<MiniYamlNode> nodes, string filename, MiniYamlNode parent, Action<string> emitError)
 		{
 			foreach (var node in nodes)
diff --git a/OpenRA.Mods.Common/Lint/CheckChromeIntegerExpressions.cs b/OpenRA.Mods.Common/Lint/CheckChromeIntegerExpressions.cs
index e170ec242d..f76c81a0b7 100644
--- a/OpenRA.Mods.Common/Lint/CheckChromeIntegerExpressions.cs
+++ b/OpenRA.Mods.Common/Lint/CheckChromeIntegerExpressions.cs
@@ -24,7 +24,7 @@ namespace OpenRA.Mods.Common.Lint
 				CheckInner(MiniYaml.FromStream(modData.DefaultFileSystem.Open(filename), filename), filename, emitError);
 		}
 
-		void CheckInner(IEnumerable<MiniYamlNode> nodes, string filename, Action<string> emitError)
+		static void CheckInner(IEnumerable<MiniYamlNode> nodes, string filename, Action<string> emitError)
 		{
 			var substitutions = new Dictionary<string, int>();
 			var readOnlySubstitutions = new ReadOnlyDictionary<string, int>(substitutions);
diff --git a/OpenRA.Mods.Common/Lint/CheckChromeLogic.cs b/OpenRA.Mods.Common/Lint/CheckChromeLogic.cs
index 8700286b96..5ad6072dd6 100644
--- a/OpenRA.Mods.Common/Lint/CheckChromeLogic.cs
+++ b/OpenRA.Mods.Common/Lint/CheckChromeLogic.cs
@@ -23,7 +23,7 @@ namespace OpenRA.Mods.Common.Lint
 				CheckInner(MiniYaml.FromStream(modData.DefaultFileSystem.Open(filename), filename), filename, emitError);
 		}
 
-		void CheckInner(IEnumerable<MiniYamlNode> nodes, string filename, Action<string> emitError)
+		static void CheckInner(IEnumerable<MiniYamlNode> nodes, string filename, Action<string> emitError)
 		{
 			foreach (var node in nodes)
 			{
diff --git a/OpenRA.Mods.Common/Traits/Buildings/Bridge.cs b/OpenRA.Mods.Common/Traits/Buildings/Bridge.cs
index eaed6a1c44..3b748e75e2 100644
--- a/OpenRA.Mods.Common/Traits/Buildings/Bridge.cs
+++ b/OpenRA.Mods.Common/Traits/Buildings/Bridge.cs
@@ -371,7 +371,7 @@ namespace OpenRA.Mods.Common.Traits
 						neighbours[d].neighbours[d].UpdateState();
 		}
 
-		void AggregateDamageState(Bridge b, int d, ref DamageState damage)
+		static void AggregateDamageState(Bridge b, int d, ref DamageState damage)
 		{
 			if (b.health.DamageState > damage)
 				damage = b.health.DamageState;