diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
index c2d87cb6ce..1fa6fa97aa 100644
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -1928,7 +1928,8 @@ static bool DoBuildStatueOfCompany(TileIndex tile, TownID town_id)
 	PlayerID old;
 	CommandCost r;
 
-	if (GetTileSlope(tile, NULL) != SLOPE_FLAT) return false;
+	/* Statues can be build on slopes, just like houses. Only the steep slopes is a no go. */
+	if (IsSteepSlope(GetTileSlope(tile, NULL))) return false;
 
 	if (!IsTileType(tile, MP_HOUSE) &&
 			!IsTileType(tile, MP_CLEAR) &&
diff --git a/src/unmovable_cmd.cpp b/src/unmovable_cmd.cpp
index ee486cbfac..c3495d7156 100644
--- a/src/unmovable_cmd.cpp
+++ b/src/unmovable_cmd.cpp
@@ -110,6 +110,8 @@ CommandCost CmdBuildCompanyHQ(TileIndex tile, uint32 flags, uint32 p1, uint32 p2
 	return cost;
 }
 
+static Foundation GetFoundation_Unmovable(TileIndex tile, Slope tileh);
+
 static void DrawTile_Unmovable(TileInfo *ti)
 {
 
@@ -132,6 +134,9 @@ static void DrawTile_Unmovable(TileInfo *ti)
 		}
 
 		case UNMOVABLE_STATUE:
+			/* This should prevent statues from sinking into the ground when on a slope. */
+			if (ti->tileh != SLOPE_FLAT) DrawFoundation(ti, GetFoundation_Unmovable(ti->tile, ti->tileh));
+
 			DrawGroundSprite(SPR_CONCRETE_GROUND, PAL_NONE);
 
 			AddSortableSpriteToDraw(SPR_STATUE_COMPANY, PLAYER_SPRITE_COLOR(GetTileOwner(ti->tile)), ti->x, ti->y, 16, 16, 25, ti->z, HASBIT(_transparent_opt, TO_STRUCTURES));