diff --git a/python-api-src/lib_unit.cpp b/python-api-src/lib_unit.cpp
index b664020e53c6c13ad260bb596e96c87e9bdad8d9..58cd791584d095e9004411896b9a29cc54db5d0f 100644
--- a/python-api-src/lib_unit.cpp
+++ b/python-api-src/lib_unit.cpp
@@ -25,7 +25,6 @@ void define_unit(py::module & m)
         .def_property_readonly("is_burrowed", &Unit::isBurrowed)
         .def_property_readonly("is_valid", &Unit::isValid)
         .def_property_readonly("is_training", &Unit::isTraining)
-        .def_property_readonly("is_constructing", &Unit::isConstructing)
         .def("stop", &Unit::stop)
         .def("attack_unit", &Unit::attackUnit)
         .def("attack_move", &Unit::attackMove)
@@ -38,6 +37,7 @@ void define_unit(py::module & m)
         .def("train", &Unit::train, "Train unit of type", "unit_type"_a)
         .def("morph", &Unit::morph, "Morph into type of unit_type", "unit_type"_a)
         .def("research", &Unit::research, "Research the given :class:`library.UPGRADE_ID`", "upgrade_id"_a)
+        .def("is_constructing", &Unit::isConstructing, "unit_type"_a)
         .def("__hash__", [](const Unit & unit) { return std::hash<const sc2::Unit *>{}(unit.getUnitPtr()); })
         .def(py::self == py::self)
         .def("__repr__", [](const Unit & unit) { return "<Unit of type: '" + unit.getType().getName() + "'>"; });