diff --git a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs
index a03f27b561..70f91a5dc1 100644
--- a/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs
+++ b/Content.Server/Atmos/EntitySystems/AtmosphereSystem.Hotspot.cs
@@ -178,7 +178,7 @@ namespace Content.Server.Atmos.EntitySystems
 
             if (tile.Hotspot.Bypassing)
             {
-                tile.Hotspot.Volume = tile.Air.ReactionResults[GasReaction.Fire] * Atmospherics.FireGrowthRate;
+                tile.Hotspot.Volume = tile.Air.ReactionResults[(byte)GasReaction.Fire] * Atmospherics.FireGrowthRate;
                 tile.Hotspot.Temperature = tile.Air.Temperature;
             }
             else
@@ -187,7 +187,7 @@ namespace Content.Server.Atmos.EntitySystems
                 affected.Temperature = tile.Hotspot.Temperature;
                 React(affected, tile);
                 tile.Hotspot.Temperature = affected.Temperature;
-                tile.Hotspot.Volume = affected.ReactionResults[GasReaction.Fire] * Atmospherics.FireGrowthRate;
+                tile.Hotspot.Volume = affected.ReactionResults[(byte)GasReaction.Fire] * Atmospherics.FireGrowthRate;
                 Merge(tile.Air, affected);
             }
 
diff --git a/Content.Server/Atmos/Reactions/PlasmaFireReaction.cs b/Content.Server/Atmos/Reactions/PlasmaFireReaction.cs
index 98d567d4ed..b214310da1 100644
--- a/Content.Server/Atmos/Reactions/PlasmaFireReaction.cs
+++ b/Content.Server/Atmos/Reactions/PlasmaFireReaction.cs
@@ -15,7 +15,7 @@ namespace Content.Server.Atmos.Reactions
             var oldHeatCapacity = atmosphereSystem.GetHeatCapacity(mixture, true);
             var temperature = mixture.Temperature;
             var location = holder as TileAtmosphere;
-            mixture.ReactionResults[GasReaction.Fire] = 0;
+            mixture.ReactionResults[(byte)GasReaction.Fire] = 0;
 
             // More plasma released at higher temperatures.
             var temperatureScale = 0f;
@@ -60,7 +60,7 @@ namespace Content.Server.Atmos.Reactions
 
                     energyReleased += Atmospherics.FirePlasmaEnergyReleased * plasmaBurnRate;
                     energyReleased /= heatScale; // adjust energy to make sure speedup doesn't cause mega temperature rise
-                    mixture.ReactionResults[GasReaction.Fire] += plasmaBurnRate * (1 + oxygenBurnRate);
+                    mixture.ReactionResults[(byte)GasReaction.Fire] += plasmaBurnRate * (1 + oxygenBurnRate);
                 }
             }
 
@@ -80,7 +80,7 @@ namespace Content.Server.Atmos.Reactions
                 }
             }
 
-            return mixture.ReactionResults[GasReaction.Fire] != 0 ? ReactionResult.Reacting : ReactionResult.NoReaction;
+            return mixture.ReactionResults[(byte)GasReaction.Fire] != 0 ? ReactionResult.Reacting : ReactionResult.NoReaction;
         }
     }
 }
diff --git a/Content.Server/Atmos/Reactions/TritiumFireReaction.cs b/Content.Server/Atmos/Reactions/TritiumFireReaction.cs
index 3ad0a4b04d..8b7d4e4872 100644
--- a/Content.Server/Atmos/Reactions/TritiumFireReaction.cs
+++ b/Content.Server/Atmos/Reactions/TritiumFireReaction.cs
@@ -15,7 +15,7 @@ namespace Content.Server.Atmos.Reactions
             var oldHeatCapacity = atmosphereSystem.GetHeatCapacity(mixture, true);
             var temperature = mixture.Temperature;
             var location = holder as TileAtmosphere;
-            mixture.ReactionResults[GasReaction.Fire] = 0f;
+            mixture.ReactionResults[(byte)GasReaction.Fire] = 0f;
             var burnedFuel = 0f;
             var initialTrit = mixture.GetMoles(Gas.Tritium);
 
@@ -45,7 +45,7 @@ namespace Content.Server.Atmos.Reactions
                 // Conservation of mass is important.
                 mixture.AdjustMoles(Gas.WaterVapor, burnedFuel);
 
-                mixture.ReactionResults[GasReaction.Fire] += burnedFuel;
+                mixture.ReactionResults[(byte)GasReaction.Fire] += burnedFuel;
             }
 
             energyReleased /= heatScale; // adjust energy to make sure speedup doesn't cause mega temperature rise
@@ -65,7 +65,7 @@ namespace Content.Server.Atmos.Reactions
                 }
             }
 
-            return mixture.ReactionResults[GasReaction.Fire] != 0 ? ReactionResult.Reacting : ReactionResult.NoReaction;
+            return mixture.ReactionResults[(byte)GasReaction.Fire] != 0 ? ReactionResult.Reacting : ReactionResult.NoReaction;
         }
     }
 }
diff --git a/Content.Shared/Atmos/GasMixture.cs b/Content.Shared/Atmos/GasMixture.cs
index deca8faaed..612626d614 100644
--- a/Content.Shared/Atmos/GasMixture.cs
+++ b/Content.Shared/Atmos/GasMixture.cs
@@ -33,10 +33,9 @@ namespace Content.Shared.Atmos
         public bool Immutable { get; private set; }
 
         [ViewVariables]
-        public readonly Dictionary<GasReaction, float> ReactionResults = new()
+        public readonly float[] ReactionResults =
         {
-            // We initialize the dictionary here.
-            { GasReaction.Fire, 0f }
+            0f,
         };
 
         [ViewVariables]