diff --git a/interoperability/ocss/time.go b/interoperability/ocss/time.go
index 7cb077f..ac6ca53 100644
--- a/interoperability/ocss/time.go
+++ b/interoperability/ocss/time.go
@@ -22,9 +22,12 @@ func (v OCSSTime) MarshalBSONValue() (bsontype.Type, []byte, error) {
 	return bson.MarshalValue(time.Time(v))
 }
 
-func (t OCSSTime) ToTime() time.Time {
-	time := time.Time(t)
-	return time
+func (t *OCSSTime) ToTime() *time.Time {
+	if t == nil {
+		return nil
+	}
+	time := time.Time(*t)
+	return &time
 }
 
 func (t *OCSSTime) UnmarshalJSON(b []byte) error {