diff --git a/qt.py b/qt.py
index e9ba575..2068338 100644
--- a/qt.py
+++ b/qt.py
@@ -4032,8 +4032,8 @@ class BalCalendar:
     @staticmethod
     def write_temp_ics(content):
         fd, path = tempfile.mkstemp(prefix="event_", suffix=".ics")
-        with os.fdopen(fd, "wb", encoding="utf-8") as f:
-            f.write(content)
+        with os.fdopen(fd, "wb") as f:
+            f.write(content.encode("utf-8"))
         return path
 
     @staticmethod