diff --git a/nh_eobs_mobile/controllers/main.py b/nh_eobs_mobile/controllers/main.py
index b75170d3..b0b08343 100755
--- a/nh_eobs_mobile/controllers/main.py
+++ b/nh_eobs_mobile/controllers/main.py
@@ -908,7 +908,9 @@ def _remove_duplicates():
                     SELECT w.name
                     FROM nh_clinical_wardboard AS wb
                     LEFT JOIN nh_clinical_location AS w ON wb.ward_id=w.id
-                    WHERE wb.id IN {}""".format(tuple(wardboard_records.ids))
+                    WHERE wb.id IN ({})""".format(
+                    ','.join(str(r) for r in wardboard_records.ids)
+                )
                 request.env.cr.execute(locations_name_query)
                 ward_names = request.env.cr.fetchall()
                 locations = set(ward_names)