diff --git a/modules/Bio/EnsEMBL/Slice.pm b/modules/Bio/EnsEMBL/Slice.pm
index 4a43e5150a62bc4236b29e68757ed8f006854a3f..01f52244f21434d70eac87f8beef19b042635b5e 100644
--- a/modules/Bio/EnsEMBL/Slice.pm
+++ b/modules/Bio/EnsEMBL/Slice.pm
@@ -1162,7 +1162,7 @@ sub desc{
 
 sub moltype {
   my $self = shift;
-  return 'DNA';
+  return 'dna';
 }
 
 =head2 accession_number