diff --git a/src/App/PropertyPythonObject.cpp b/src/App/PropertyPythonObject.cpp
index 837c3a5337..0efc797efb 100644
--- a/src/App/PropertyPythonObject.cpp
+++ b/src/App/PropertyPythonObject.cpp
@@ -92,6 +92,14 @@ std::string PropertyPythonObject::toString() const
             Py::Callable state(this->object.getAttr("dumps"));
             dump = state.apply(args);
         }
+#if PY_VERSION_HEX < 0x030b0000
+        // support add-ons that use the old method names
+        else if (this->object.hasAttr("__getstate__")) {
+            Py::Tuple args;
+            Py::Callable state(this->object.getAttr("__getstate__"));
+            dump = state.apply(args);
+        }
+#endif
         else if (this->object.hasAttr("__dict__")) {
             dump = this->object.getAttr("__dict__");
         }
@@ -135,6 +143,15 @@ void PropertyPythonObject::fromString(const std::string& repr)
             Py::Callable state(this->object.getAttr("loads"));
             state.apply(args);
         }
+#if PY_VERSION_HEX < 0x030b0000
+        // support add-ons that use the old method names
+        else if (this->object.hasAttr("__setstate__")) {
+            Py::Tuple args(1);
+            args.setItem(0, res);
+            Py::Callable state(this->object.getAttr("__setstate__"));
+            state.apply(args);
+        }
+#endif
         else if (this->object.hasAttr("__dict__")) {
             if (!res.isNone()) {
                 this->object.setAttr("__dict__", res);