diff --git a/src/Battlescape/BattlescapeGenerator.cpp b/src/Battlescape/BattlescapeGenerator.cpp
index b56d6bdf3c..997f92ff09 100644
--- a/src/Battlescape/BattlescapeGenerator.cpp
+++ b/src/Battlescape/BattlescapeGenerator.cpp
@@ -2276,7 +2276,14 @@ void BattlescapeGenerator::generateMap(const std::vector<MapScript*> *script, co
 				_placedBlockRects.clear();
 
 				RuleTerrain *terrain;
-				terrain = pickTerrain(command->getAlternateTerrain());
+				if (!command->getAlternateTerrain().empty()) {
+					size_t pick = RNG::generate(0, command->getAlternateTerrain().size() - 1);
+					terrain = pickTerrain(command->getAlternateTerrain().at(pick));
+				}
+				else {
+					terrain = pickTerrain("");
+				}
+				
 
 				if (doLevels)
 				{
@@ -2998,7 +3005,14 @@ void BattlescapeGenerator::loadVerticalLevels(MapScript *command, bool repopulat
 		MapBlock *block = _blocks[x][y];
 
 		std::vector<VerticalLevel>::iterator currentLevel = _verticalLevels.begin();
-		RuleTerrain *terrain = pickTerrain(command->getAlternateTerrain());
+		RuleTerrain* terrain;
+		if (!command->getAlternateTerrain().empty()) {
+			size_t pick = RNG::generate(0, command->getAlternateTerrain().size() - 1);
+			terrain = pickTerrain(command->getAlternateTerrain().at(pick));
+		}
+		else {
+			terrain = pickTerrain("");
+		}
 
 		int zOffset = 0;
 		int zLevelsLeft = command->getSizeZ();
diff --git a/src/Menu/TestState.cpp b/src/Menu/TestState.cpp
index e16ee01439..2dc42d138b 100644
--- a/src/Menu/TestState.cpp
+++ b/src/Menu/TestState.cpp
@@ -256,8 +256,14 @@ void TestState::testCase4()
 	}
 	for (auto &mapScript : _game->getMod()->getMapScriptsRaw())
 	{
-		for (auto &mapScriptCommand : mapScript.second)
-			terrainMap[mapScriptCommand->getAlternateTerrain()] += 1;
+		for (auto& mapScriptCommand : mapScript.second)
+			if (!mapScriptCommand->getAlternateTerrain().empty()) {
+				size_t pick = RNG::generate(0, mapScriptCommand->getAlternateTerrain().size() - 1);
+				terrainMap[mapScriptCommand->getAlternateTerrain().at(pick)] += 1;
+			}
+			else {
+				terrainMap[""];
+			}
 	}
 
 	// erase false positives
diff --git a/src/Mod/MapScript.cpp b/src/Mod/MapScript.cpp
index c06a11ad55..d6498f4e18 100644
--- a/src/Mod/MapScript.cpp
+++ b/src/Mod/MapScript.cpp
@@ -29,7 +29,7 @@ namespace OpenXcom
 {
 
 MapScript::MapScript() : _type(MSC_UNDEFINED), _canBeSkipped(true), _sizeX(1), _sizeY(1), _sizeZ(0), _executionChances(100), _executions(1), _cumulativeFrequency(0), _label(0),
-						 _direction(MD_NONE), _verticalGroup(MT_NSROAD), _horizontalGroup(MT_EWROAD), _crossingGroup(MT_CROSSING), _tunnelData(0), _terrain(""), _verticalLevels()
+						 _direction(MD_NONE), _verticalGroup(MT_NSROAD), _horizontalGroup(MT_EWROAD), _crossingGroup(MT_CROSSING), _tunnelData(0), _terrain(), _verticalLevels()
 {
 }
 
@@ -263,7 +263,7 @@ void MapScript::load(const YAML::Node& node)
 	_executions = node["executions"].as<int>(_executions);
 	_ufoName = node["UFOName"].as<std::string>(_ufoName);
 	_craftName = node["craftName"].as<std::string>(_craftName);
-	_terrain = node["terrain"].as<std::string>(_terrain);
+	_terrain = node["terrain"].as<std::vector<std::string>>(_terrain);
 	// take no chances, don't accept negative values here.
 	_label = std::abs(node["label"].as<int>(_label));
 
@@ -438,7 +438,7 @@ std::string MapScript::getCraftName()
  * Gets the terrain name in the case of addBlockFromTerrain or fillAreaFromTerrain
  * @return the terrain name.
  */
-std::string MapScript::getAlternateTerrain() const
+std::vector<std::string> MapScript::getAlternateTerrain() const
 {
 	return _terrain;
 }
diff --git a/src/Mod/MapScript.h b/src/Mod/MapScript.h
index 3e94e4abc0..3ed0d0877f 100644
--- a/src/Mod/MapScript.h
+++ b/src/Mod/MapScript.h
@@ -179,7 +179,8 @@ class MapScript
 	int _sizeX, _sizeY, _sizeZ, _executionChances, _executions, _cumulativeFrequency, _label;
 	MapDirection _direction;
 	TunnelData *_tunnelData;
-	std::string _ufoName, _craftName, _terrain;
+	std::string _ufoName, _craftName;
+	std::vector<std::string> _terrain;
 	std::vector<VerticalLevel> _verticalLevels;
 
 	/// Randomly generate a group from within the array.
@@ -236,7 +237,7 @@ class MapScript
 	/// Gets the craft's name (for addCraft)
 	std::string getCraftName();
 	/// Gets alternate terrain for a command other than the one in alienDeploments
-	std::string getAlternateTerrain() const;
+	std::vector<std::string> getAlternateTerrain() const;
 	/// Gets the vertical levels for a command
 	const std::vector<VerticalLevel> &getVerticalLevels() const;
 	/// Sets the vertical levels for a command from a base facility's vertical levels