diff --git a/sql/moz-fx-data-shared-prod/telemetry_derived/clients_last_seen_joined_v1/schema.yaml b/sql/moz-fx-data-shared-prod/telemetry_derived/clients_last_seen_joined_v1/schema.yaml
index c203939c7f8..206df88b624 100644
--- a/sql/moz-fx-data-shared-prod/telemetry_derived/clients_last_seen_joined_v1/schema.yaml
+++ b/sql/moz-fx-data-shared-prod/telemetry_derived/clients_last_seen_joined_v1/schema.yaml
@@ -2104,3 +2104,6 @@ fields:
   - name: value
     type: INTEGER
     mode: NULLABLE
+- name: startup_profile_selection_reason_first
+  type: STRING
+  mode: NULLABLE