diff --git a/src/runner/pythonrunner.cpp b/src/runner/pythonrunner.cpp
index 5f82d52..9dd85f7 100644
--- a/src/runner/pythonrunner.cpp
+++ b/src/runner/pythonrunner.cpp
@@ -1254,21 +1254,23 @@ bool PythonRunner::initPython(const QString &pythonPath)
 
     PySys_SetArgv(0, (wchar_t**)&argBuffer);
 
-    const auto dlls = QCoreApplication::applicationDirPath().toStdString() + "/dlls";
-
-    bpy::object mainModule = bpy::import("__main__");
-    bpy::object mainNamespace = mainModule.attr("__dict__");
+    auto os = bpy::import("os");
+    auto mainModule = bpy::import("__main__");
+    auto mainNamespace = mainModule.attr("__dict__");
+    mainNamespace["os"] = os;
     mainNamespace["sys"] = bpy::import("sys");
     mainNamespace["moprivate"] = bpy::import("moprivate");
     mainNamespace["mobase"] = bpy::import("mobase");
     bpy::import("site");
-    bpy::exec(("import os\n"
-              "sys.stdout = moprivate.PrintWrapper()\n"
+    bpy::exec("sys.stdout = moprivate.PrintWrapper()\n"
               "sys.stderr = moprivate.ErrWrapper.instance()\n"
-              "sys.excepthook = lambda x, y, z: sys.__excepthook__(x, y, z)\n"
-              "os.add_dll_directory('" + dlls + "')").c_str(),
+              "sys.excepthook = sys.__excepthook__\n",
                         mainNamespace);
 
+    // add dlls directory
+    const auto dlls = QCoreApplication::applicationDirPath().toStdString() + "/dlls";
+    os.attr("add_dll_directory")(dlls);
+
     configure_python_logging(mainNamespace["mobase"]);
 
     PyEval_SaveThread();