diff --git a/CHANGELOG.md b/CHANGELOG.md
index d7723287..77b3f243 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Public API for actions now wraps webhooks @mderynck ([#2790](https://github.com/grafana/oncall/pull/2790))
 - Allow mobile app to access status endpoint @mderynck ([#2791](https://github.com/grafana/oncall/pull/2791))
 - Enable shifts export endpoint for all schedule types ([#2863](https://github.com/grafana/oncall/pull/2863))
+- Use priority field to track primary/overrides calendar in schedule iCal export ([#2871](https://github.com/grafana/oncall/pull/2871))
 
 ## v1.3.26 (2023-08-22)
 
diff --git a/engine/apps/schedules/constants.py b/engine/apps/schedules/constants.py
index 492aa6bb..317a609f 100644
--- a/engine/apps/schedules/constants.py
+++ b/engine/apps/schedules/constants.py
@@ -13,6 +13,7 @@ ICAL_RRULE = "RRULE"
 ICAL_UNTIL = "UNTIL"
 ICAL_LAST_MODIFIED = "LAST-MODIFIED"
 ICAL_LOCATION = "LOCATION"
+ICAL_PRIORITY = "PRIORITY"
 ICAL_STATUS = "STATUS"
 ICAL_STATUS_CANCELLED = "CANCELLED"
 ICAL_COMPONENT_VEVENT = "VEVENT"
diff --git a/engine/apps/schedules/ical_utils.py b/engine/apps/schedules/ical_utils.py
index bd467c10..5f3c82fa 100644
--- a/engine/apps/schedules/ical_utils.py
+++ b/engine/apps/schedules/ical_utils.py
@@ -22,6 +22,7 @@ from apps.schedules.constants import (
     ICAL_DATETIME_START,
     ICAL_DESCRIPTION,
     ICAL_LOCATION,
+    ICAL_PRIORITY,
     ICAL_RECURRENCE_ID,
     ICAL_SEQUENCE,
     ICAL_STATUS,
@@ -218,7 +219,12 @@ def get_shifts_dict(
         if calendar_type == CALENDAR_TYPE_FINAL:
             event_calendar_type = (
                 schedule.OVERRIDES
-                if event.get(ICAL_LOCATION, "") == schedule.CALENDAR_TYPE_VERBAL[schedule.OVERRIDES]
+                if (
+                    event.get(ICAL_PRIORITY, "") == schedule.OVERRIDES
+                    or
+                    # keep for backwards compatibility (to be removed later once schedules are refreshed)
+                    event.get(ICAL_LOCATION, "") == schedule.CALENDAR_TYPE_VERBAL[schedule.OVERRIDES]
+                )
                 else schedule.PRIMARY
             )
         # Define on-call shift out of ical event that has the actual user
diff --git a/engine/apps/schedules/models/on_call_schedule.py b/engine/apps/schedules/models/on_call_schedule.py
index 7c0820f4..c9962aa9 100644
--- a/engine/apps/schedules/models/on_call_schedule.py
+++ b/engine/apps/schedules/models/on_call_schedule.py
@@ -27,7 +27,7 @@ from apps.schedules.constants import (
     ICAL_DATETIME_STAMP,
     ICAL_DATETIME_START,
     ICAL_LAST_MODIFIED,
-    ICAL_LOCATION,
+    ICAL_PRIORITY,
     ICAL_STATUS,
     ICAL_STATUS_CANCELLED,
     ICAL_SUMMARY,
@@ -461,7 +461,9 @@ class OnCallSchedule(PolymorphicModel):
                 event.add(ICAL_DATETIME_END, e["end"])
                 event.add(ICAL_DATETIME_STAMP, now)
                 event.add(ICAL_LAST_MODIFIED, now)
-                event.add(ICAL_LOCATION, self.CALENDAR_TYPE_VERBAL.get(e["calendar_type"], ""))
+                # set priority based on primary/overrides
+                # 0: undefined priority, 1: high priority
+                event.add(ICAL_PRIORITY, e["calendar_type"])
                 event_uid = "{}-{}-{}".format(e["shift"]["pk"], e["start"].strftime("%Y%m%d%H%S"), u["pk"])
                 event[ICAL_UID] = event_uid
                 calendar.add_component(event)
diff --git a/engine/apps/schedules/tests/test_on_call_schedule.py b/engine/apps/schedules/tests/test_on_call_schedule.py
index aeafe782..11fce2ed 100644
--- a/engine/apps/schedules/tests/test_on_call_schedule.py
+++ b/engine/apps/schedules/tests/test_on_call_schedule.py
@@ -13,7 +13,7 @@ from apps.schedules.constants import (
     ICAL_DATETIME_END,
     ICAL_DATETIME_START,
     ICAL_LAST_MODIFIED,
-    ICAL_LOCATION,
+    ICAL_PRIORITY,
     ICAL_STATUS,
     ICAL_STATUS_CANCELLED,
     ICAL_SUMMARY,
@@ -1663,25 +1663,25 @@ def test_refresh_ical_final_schedule_ok(
             u1.username,
             today,
             today + timezone.timedelta(seconds=(12 * 60 * 60) - 1),
-            OnCallSchedule.CALENDAR_TYPE_VERBAL[OnCallSchedule.PRIMARY],
+            OnCallSchedule.PRIMARY,
         ),
         (
             u2.username,
             today + timezone.timedelta(hours=12),
             today + timezone.timedelta(hours=22),
-            OnCallSchedule.CALENDAR_TYPE_VERBAL[OnCallSchedule.PRIMARY],
+            OnCallSchedule.PRIMARY,
         ),
         (
             u1.username,
             today + timezone.timedelta(hours=22),
             today + timezone.timedelta(hours=23),
-            OnCallSchedule.CALENDAR_TYPE_VERBAL[OnCallSchedule.OVERRIDES],
+            OnCallSchedule.OVERRIDES,
         ),
         (
             u2.username,
             today + timezone.timedelta(hours=23),
             today + timezone.timedelta(seconds=(24 * 60 * 60) - 1),
-            OnCallSchedule.CALENDAR_TYPE_VERBAL[OnCallSchedule.PRIMARY],
+            OnCallSchedule.PRIMARY,
         ),
     }
 
@@ -1699,7 +1699,7 @@ def test_refresh_ical_final_schedule_ok(
                     component[ICAL_SUMMARY],
                     component[ICAL_DATETIME_START].dt,
                     component[ICAL_DATETIME_END].dt,
-                    component[ICAL_LOCATION],
+                    component[ICAL_PRIORITY],
                 )
                 assert event in expected_events