diff --git a/Defs/GasDefs.xml b/Defs/GasDefs.xml
index 58b3de0..9e6c615 100644
--- a/Defs/GasDefs.xml
+++ b/Defs/GasDefs.xml
@@ -26,7 +26,7 @@
 
 	<PerformanceFish.GasDef>
 		<defName>DeadLifeDust</defName>
-		<label>dead life dust</label>
+		<label>deadlife dust</label>
 		<dissipationRate>3</dissipationRate>
 		<diffuses>true</diffuses>
 		<color>(3,13,51)</color>
diff --git a/Source/PerformanceFish/GasDef.cs b/Source/PerformanceFish/GasDef.cs
index f5422eb..4293596 100644
--- a/Source/PerformanceFish/GasDef.cs
+++ b/Source/PerformanceFish/GasDef.cs
@@ -20,6 +20,9 @@ public class GasDef : Def
 			GasType.BlindSmoke => GasDefOf.BlindSmoke,
 			GasType.RotStink => GasDefOf.RotStink,
 			GasType.ToxGas => GasDefOf.ToxGas,
+#if !V1_4
+			GasType.DeadlifeDust => GasDefOf.DeadLifeDust,
+#endif
 			_ => null
 		};
 }
\ No newline at end of file
diff --git a/Source/PerformanceFish/GasGridOptimization.cs b/Source/PerformanceFish/GasGridOptimization.cs
index 0605bf8..3b5e3bf 100644
--- a/Source/PerformanceFish/GasGridOptimization.cs
+++ b/Source/PerformanceFish/GasGridOptimization.cs
@@ -26,6 +26,13 @@ namespace PerformanceFish;
 
 public sealed class GasGridOptimization : ClassWithFishPrepatches
 {
+	private const int START_INDEX
+#if V1_4
+		= 3;
+#else
+		= 4;
+#endif
+
 	public sealed class SetDirectPatch : FishPrepatch
 	{
 		public override bool ShowSettings => false;
@@ -493,7 +500,7 @@ public sealed class GasGridOptimization : ClassWithFishPrepatches
 		{
 			var gasDefs = DefDatabase<GasDef>.AllDefsListForReading;
 
-			for (var i = 3; i < gasDefs.Count; i++)
+			for (var i = START_INDEX; i < gasDefs.Count; i++)
 			{
 				var gasDef = gasDefs[i];
 				
@@ -550,7 +557,7 @@ public sealed class GasGridOptimization : ClassWithFishPrepatches
 			var gasGrids = map.gasGrid.ParallelGasGrids();
 			var cellIndex = new CellIndex(cell, map);
 
-			for (var i = 3; i < gasGrids.Length; i++)
+			for (var i = START_INDEX; i < gasGrids.Length; i++)
 			{
 				var gasGrid = gasGrids[i];
 				if (!gasGrid.AnyGasAt(cellIndex))