diff --git a/modules/Bio/EnsEMBL/DnaDnaAlignFeature.pm b/modules/Bio/EnsEMBL/DnaDnaAlignFeature.pm
index e309969bbe57d23edcf023a9fede5871426bdf9d..49c184482d8c1f8196f26dbb08ebf31bcf7bcfb9 100644
--- a/modules/Bio/EnsEMBL/DnaDnaAlignFeature.pm
+++ b/modules/Bio/EnsEMBL/DnaDnaAlignFeature.pm
@@ -50,6 +50,7 @@ use vars qw(@ISA);
 use Bio::SimpleAlign;
 use Bio::LocatableSeq;
 use Bio::EnsEMBL::Utils::Argument qw(rearrange);
+use Bio::EnsEMBL::Utils::Exception qw(throw);
 
 @ISA = qw( Bio::EnsEMBL::BaseAlignFeature );