diff --git a/src/Gui/WidgetFactory.cpp b/src/Gui/WidgetFactory.cpp
index 99e3f7ef29..4207d26070 100644
--- a/src/Gui/WidgetFactory.cpp
+++ b/src/Gui/WidgetFactory.cpp
@@ -680,7 +680,10 @@ Py::Object PySideUicModule::loadUiType(const Py::Tuple& args)
     str << "import pyside2uic\n"
         << "from PySide2 import QtCore, QtGui, QtWidgets\n"
         << "import xml.etree.ElementTree as xml\n"
-        << "from cStringIO import StringIO\n"
+        << "try:\n"
+        << "    from cStringIO import StringIO\n"
+        << "except:\n"
+        << "    from io import StringIO\n"
         << "\n"
         << "uiFile = \"" << file.c_str() << "\"\n"
         << "parsed = xml.parse(uiFile)\n"
@@ -691,7 +694,7 @@ Py::Object PySideUicModule::loadUiType(const Py::Tuple& args)
         << "    frame = {}\n"
         << "    pyside2uic.compileUi(f, o, indent=0)\n"
         << "    pyc = compile(o.getvalue(), '<string>', 'exec')\n"
-        << "    exec pyc in frame\n"
+        << "    exec(pyc, frame)\n"
         << "    #Fetch the base_class and form class based on their type in the xml from designer\n"
         << "    form_class = frame['Ui_%s'%form_class]\n"
         << "    base_class = eval('QtWidgets.%s'%widget_class)\n";
@@ -699,7 +702,10 @@ Py::Object PySideUicModule::loadUiType(const Py::Tuple& args)
     str << "import pysideuic\n"
         << "from PySide import QtCore, QtGui\n"
         << "import xml.etree.ElementTree as xml\n"
-        << "from cStringIO import StringIO\n"
+        << "try:\n"
+        << "    from cStringIO import StringIO\n"
+        << "except:\n"
+        << "    from io import StringIO\n"
         << "\n"
         << "uiFile = \"" << file.c_str() << "\"\n"
         << "parsed = xml.parse(uiFile)\n"
@@ -710,7 +716,7 @@ Py::Object PySideUicModule::loadUiType(const Py::Tuple& args)
         << "    frame = {}\n"
         << "    pysideuic.compileUi(f, o, indent=0)\n"
         << "    pyc = compile(o.getvalue(), '<string>', 'exec')\n"
-        << "    exec pyc in frame\n"
+        << "    exec(pyc, frame)\n"
         << "    #Fetch the base_class and form class based on their type in the xml from designer\n"
         << "    form_class = frame['Ui_%s'%form_class]\n"
         << "    base_class = eval('QtGui.%s'%widget_class)\n";