diff --git a/modules/Bio/EnsEMBL/IdMapping/InternalIdMapper.pm b/modules/Bio/EnsEMBL/IdMapping/InternalIdMapper.pm
index 8516bccd940897b982e8a19d86736b48d93ad5a0..1ff9a12aeb02272fbab01db1af506aaf837c62ee 100644
--- a/modules/Bio/EnsEMBL/IdMapping/InternalIdMapper.pm
+++ b/modules/Bio/EnsEMBL/IdMapping/InternalIdMapper.pm
@@ -199,6 +199,7 @@ sub map_transcripts {
       Bio::EnsEMBL::IdMapping::InternalIdMapper::EnsemblTranscriptGeneric::init_basic
       Bio::EnsEMBL::IdMapping::InternalIdMapper::EnsemblTranscriptGeneric::non_exact_translation
       Bio::EnsEMBL::IdMapping::InternalIdMapper::EnsemblTranscriptGeneric::mapped_gene
+      Bio::EnsEMBL::IdMapping::InternalIdMapper::EnsemblTranscriptGeneric::biotype
       Bio::EnsEMBL::IdMapping::InternalIdMapper::EnsemblTranscriptGeneric::internal_id
       Bio::EnsEMBL::IdMapping::InternalIdMapper::EnsemblTranscriptGeneric::single_gene
     ));