diff --git a/apps/openmw/mwlua/objectbindings.cpp b/apps/openmw/mwlua/objectbindings.cpp
index 6d32240565..d87f0de37d 100644
--- a/apps/openmw/mwlua/objectbindings.cpp
+++ b/apps/openmw/mwlua/objectbindings.cpp
@@ -501,10 +501,11 @@ namespace MWLua
                     });
                 };
                 objectT["setTransform"] = [context](const GObject& object, const osg::Vec3f& newPos,
-                                              const sol::object& newRotObj, bool terrainClamp = true) {
+                                              sol::object newRotObj, sol::optional<bool> terrainClampOpt) {
+                    bool terrainClamp = terrainClampOpt.value_or(true);
                     MWWorld::Ptr ptr = object.ptr();
                     if (ptr.getCellRef().getCount() == 0 || !ptr.isInCell())
-                        throw std::runtime_error("Object is either removed or already in the process of teleporting");
+                        throw std::runtime_error("Object is either removed or in the process of teleporting");
 
                     osg::Vec3f finalPos = newPos;