diff --git a/spinetoolbox/main.py b/spinetoolbox/main.py
index 97ac4acd6..c946b7297 100644
--- a/spinetoolbox/main.py
+++ b/spinetoolbox/main.py
@@ -13,6 +13,7 @@
 """Provides the main() function."""
 import multiprocessing
 import os
+import asyncio
 import PySide6
 
 dirname = os.path.dirname(PySide6.__file__)
@@ -38,6 +39,7 @@
 
 def main():
     """Creates main window GUI and starts main event loop."""
+    asyncio.set_event_loop_policy(asyncio.WindowsSelectorEventLoopPolicy())
     multiprocessing.freeze_support()
     logging.basicConfig(
         stream=sys.stderr,