diff --git a/internal/query/instance.go b/internal/query/instance.go
index 8a683d7f26..ba28bb6a24 100644
--- a/internal/query/instance.go
+++ b/internal/query/instance.go
@@ -291,7 +291,7 @@ func prepareInstancesQuery(ctx context.Context, db prepareDatabase) (sq.SelectBu
 	return sq.Select(
 			InstanceColumnID.identifier(),
 			countColumn.identifier(),
-		).From(instanceTable.identifier()).
+		).Distinct().From(instanceTable.identifier()).
 			LeftJoin(join(InstanceDomainInstanceIDCol, InstanceColumnID)),
 		func(builder sq.SelectBuilder) sq.SelectBuilder {
 			return sq.Select(
diff --git a/internal/query/instance_test.go b/internal/query/instance_test.go
index 27e206e0ee..decd687e29 100644
--- a/internal/query/instance_test.go
+++ b/internal/query/instance_test.go
@@ -55,7 +55,7 @@ var (
 		` projections.instance_domains.creation_date,` +
 		` projections.instance_domains.change_date, ` +
 		` projections.instance_domains.sequence` +
-		` FROM (SELECT projections.instances.id, COUNT(*) OVER () FROM projections.instances` +
+		` FROM (SELECT DISTINCT projections.instances.id, COUNT(*) OVER () FROM projections.instances` +
 		` LEFT JOIN projections.instance_domains ON projections.instances.id = projections.instance_domains.instance_id) AS f` +
 		` LEFT JOIN projections.instances ON f.id = projections.instances.id` +
 		` LEFT JOIN projections.instance_domains ON f.id = projections.instance_domains.instance_id` +