diff --git a/Content.Server/GameObjects/Components/Atmos/GridAtmosphereComponent.cs b/Content.Server/GameObjects/Components/Atmos/GridAtmosphereComponent.cs
index c7207ffa4e..cb938944b4 100644
--- a/Content.Server/GameObjects/Components/Atmos/GridAtmosphereComponent.cs
+++ b/Content.Server/GameObjects/Components/Atmos/GridAtmosphereComponent.cs
@@ -154,13 +154,14 @@ namespace Content.Server.GameObjects.Components.Atmos
                 if (tile == null)
                 {
                     tile = new TileAtmosphere(this, _grid.Index, indices, new GasMixture(GetVolumeForCells(1)){Temperature = Atmospherics.T20C});
-                    _tiles.Add(indices, tile);
+                    _tiles[indices] = tile;
                 }
 
                 if (IsSpace(indices))
                 {
                     tile.Air = new GasMixture(GetVolumeForCells(1));
                     tile.Air.MarkImmutable();
+                    _tiles[indices] = tile;
 
                 } else if (IsAirBlocked(indices))
                 {
@@ -176,6 +177,7 @@ namespace Content.Server.GameObjects.Components.Atmos
                         {
                             var adjacent = GetAdjacentTiles(indices);
                             tile.Air = new GasMixture(GetVolumeForCells(1)){Temperature = Atmospherics.T20C};
+                            _tiles[indices] = tile;
 
                             var ratio = 1f / adjacent.Count;