diff --git a/modules/Bio/EnsEMBL/Utils/SeqRegionCache.pm b/modules/Bio/EnsEMBL/Utils/SeqRegionCache.pm
index 703af8507fa6e4e865f7d20ac0f3004ea89720cc..79f99bfa072715517e6351ab8395bd804cd2dd6d 100644
--- a/modules/Bio/EnsEMBL/Utils/SeqRegionCache.pm
+++ b/modules/Bio/EnsEMBL/Utils/SeqRegionCache.pm
@@ -4,10 +4,10 @@ use Bio::EnsEMBL::Utils::Cache;
 
 package Bio::EnsEMBL::Utils::SeqRegionCache;
 
-my $SEQ_REGION_CACHE_SIZE = 4000;
+our $SEQ_REGION_CACHE_SIZE = 4000;
 
-my %sr_id_cache;
-my %sr_name_cache;
+our %sr_id_cache;
+our %sr_name_cache;
 
 tie(%sr_name_cache, 'Bio::EnsEMBL::Utils::Cache', $SEQ_REGION_CACHE_SIZE);
 tie(%sr_name_cache, 'Bio::EnsEMBL::Utils::Cache', $SEQ_REGION_CACHE_SIZE);