diff --git a/thoth-api/migrations/v0.11.19/down.sql b/thoth-api/migrations/v0.12.2/down.sql
similarity index 100%
rename from thoth-api/migrations/v0.11.19/down.sql
rename to thoth-api/migrations/v0.12.2/down.sql
diff --git a/thoth-api/migrations/v0.11.19/up.sql b/thoth-api/migrations/v0.12.2/up.sql
similarity index 100%
rename from thoth-api/migrations/v0.11.19/up.sql
rename to thoth-api/migrations/v0.12.2/up.sql
diff --git a/thoth-api/migrations/v0.11.18/down.sql b/thoth-api/migrations/v0.12.3/down.sql
similarity index 100%
rename from thoth-api/migrations/v0.11.18/down.sql
rename to thoth-api/migrations/v0.12.3/down.sql
diff --git a/thoth-api/migrations/v0.11.18/up.sql b/thoth-api/migrations/v0.12.3/up.sql
similarity index 100%
rename from thoth-api/migrations/v0.11.18/up.sql
rename to thoth-api/migrations/v0.12.3/up.sql
diff --git a/thoth-export-server/src/marc21/marc21record_thoth.rs b/thoth-export-server/src/marc21/marc21record_thoth.rs
index 36060c469..88772b139 100644
--- a/thoth-export-server/src/marc21/marc21record_thoth.rs
+++ b/thoth-export-server/src/marc21/marc21record_thoth.rs
@@ -636,10 +636,10 @@ impl Marc21Field<Marc21RecordThoth> for WorkIssues {
                 })
                 .and_then(|f| 
                     self.series.issn_digital.as_ref()
-                    .map_or(Ok(f), |issn_digital| f.add_subfield(b"x", issn_digital.as_bytes())))
+                    .map_or(Ok(f.clone()), |issn_digital| f.add_subfield(b"x", issn_digital.as_bytes())))
                 .and_then(|f| 
                     self.series.issn_print.as_ref()
-                    .map_or(Ok(f), |issn_print| f.add_subfield(b"x", issn_print.as_bytes())))
+                    .map_or(Ok(f.clone()), |issn_print| f.add_subfield(b"x", issn_print.as_bytes())))
                 .and_then(|f| builder.add_field(f))?;
         }
         Ok(())