diff --git a/src/Mod/Part/App/AppPartPy.cpp b/src/Mod/Part/App/AppPartPy.cpp
index b4143b1520..aa407ac12a 100644
--- a/src/Mod/Part/App/AppPartPy.cpp
+++ b/src/Mod/Part/App/AppPartPy.cpp
@@ -1841,11 +1841,19 @@ private:
             if (!p) {
                 throw Py::TypeError("** makeWireString can't convert PyString.");
             }
+#if PY_VERSION_HEX >= 0x03030000
             pysize = PyUnicode_GetLength(p);
+#else
+            pysize = PyUnicode_GetSize(p);
+#endif
             unichars = PyUnicode_AS_UNICODE(p);
         }
         else if (PyUnicode_Check(intext)) {
+#if PY_VERSION_HEX >= 0x03030000
             pysize = PyUnicode_GetLength(intext);
+#else
+            pysize = PyUnicode_GetSize(intext);
+#endif
             unichars = PyUnicode_AS_UNICODE(intext);
         }
         else {