diff --git a/OpenRA.Mods.Common/Traits/Buildings/FootprintUtils.cs b/OpenRA.Mods.Common/Traits/Buildings/FootprintUtils.cs
index defa93a0bf..f2467eb682 100644
--- a/OpenRA.Mods.Common/Traits/Buildings/FootprintUtils.cs
+++ b/OpenRA.Mods.Common/Traits/Buildings/FootprintUtils.cs
@@ -17,7 +17,7 @@ namespace OpenRA.Mods.Common.Traits
 {
 	public static class FootprintUtils
 	{
-		public static IEnumerable<CPos> Tiles(Ruleset rules, string name, BuildingInfo buildingInfo, CPos topLeft)
+		public static IEnumerable<CPos> Tiles(Ruleset rules, string name, BuildingInfo buildingInfo, CPos topLeft, bool includePassable = false)
 		{
 			var dim = buildingInfo.Dimensions;
 
@@ -30,7 +30,7 @@ namespace OpenRA.Mods.Common.Traits
 				footprint = footprint.Concat(new char[dim.X]);
 			}
 
-			return TilesWhere(name, dim, footprint.ToArray(), a => a != '_').Select(t => t + topLeft);
+			return TilesWhere(name, dim, footprint.ToArray(), a => includePassable || a != '_').Select(t => t + topLeft);
 		}
 
 		public static IEnumerable<CPos> Tiles(Actor a)
@@ -38,6 +38,11 @@ namespace OpenRA.Mods.Common.Traits
 			return Tiles(a.World.Map.Rules, a.Info.Name, a.Info.TraitInfo<BuildingInfo>(), a.Location);
 		}
 
+		public static IEnumerable<CPos> FrozenUnderFogTiles(Actor a)
+		{
+			return Tiles(a.World.Map.Rules, a.Info.Name, a.Info.TraitInfo<BuildingInfo>(), a.Location, true);
+		}
+
 		public static IEnumerable<CPos> UnpathableTiles(string name, BuildingInfo buildingInfo, CPos position)
 		{
 			var footprint = buildingInfo.Footprint.Where(x => !char.IsWhiteSpace(x)).ToArray();
diff --git a/OpenRA.Mods.Common/Traits/Modifiers/FrozenUnderFog.cs b/OpenRA.Mods.Common/Traits/Modifiers/FrozenUnderFog.cs
index b21f1a279c..bf7470df0b 100644
--- a/OpenRA.Mods.Common/Traits/Modifiers/FrozenUnderFog.cs
+++ b/OpenRA.Mods.Common/Traits/Modifiers/FrozenUnderFog.cs
@@ -56,7 +56,7 @@ namespace OpenRA.Mods.Common.Traits
 			// Explore map-placed actors if the "Explore Map" option is enabled
 			var exploredMap = !init.World.LobbyInfo.GlobalSettings.Shroud;
 			startsRevealed = exploredMap && init.Contains<SpawnedByMapInit>() && !init.Contains<HiddenUnderFogInit>();
-			var footprintCells = FootprintUtils.Tiles(init.Self).ToList();
+			var footprintCells = FootprintUtils.FrozenUnderFogTiles(init.Self).ToList();
 			footprint = footprintCells.SelectMany(c => map.ProjectedCellsCovering(c.ToMPos(map))).ToArray();
 		}