diff --git a/syncall/caldav/caldav_side.py b/syncall/caldav/caldav_side.py
index 65871d9..3f459c9 100644
--- a/syncall/caldav/caldav_side.py
+++ b/syncall/caldav/caldav_side.py
@@ -29,6 +29,7 @@ class CaldavSide(SyncSide):
         "status",
         "summary",
         "due",
+        "priority",
         SYNCALL_TW_WAITING,
     )
 
diff --git a/syncall/tw_caldav_utils.py b/syncall/tw_caldav_utils.py
index bd9da4b..df3e7e0 100644
--- a/syncall/tw_caldav_utils.py
+++ b/syncall/tw_caldav_utils.py
@@ -92,7 +92,7 @@ def convert_tw_to_caldav(tw_item: Item) -> Item:
     if "priority" in tw_item:
         caldav_item["priority"] = aliases_tw_caldav_priority[tw_item["priority"].lower()]
     else:
-        caldav_item["priority"] = ""
+        caldav_item["priority"] = 0
 
     # Timestamps
     if "entry" in tw_item:
diff --git a/tests/test_tw_caldav_conversions.py b/tests/test_tw_caldav_conversions.py
index c84e5ec..8919f8b 100644
--- a/tests/test_tw_caldav_conversions.py
+++ b/tests/test_tw_caldav_conversions.py
@@ -26,7 +26,7 @@
 caldav_pending_item = {
     "summary": "task in project - and with date",
     "description": "",
-    "priority": "",
+    "priority": 0,
     SYNCALL_TW_UUID: "4471f2ac-4a70-4012-9eff-b4ddfc860d26",
     "status": "needs-action",
     SYNCALL_TW_WAITING: "false",