diff --git a/Koha/Library/Group.pm b/Koha/Library/Group.pm
index 144ee3000e..ad2063b168 100644
--- a/Koha/Library/Group.pm
+++ b/Koha/Library/Group.pm
@@ -108,7 +108,7 @@ sub store {
 
 =cut
 
-sub type {
+sub _type {
     return 'LibraryGroup';
 }
 
diff --git a/Koha/Library/Groups.pm b/Koha/Library/Groups.pm
index b56baae1b2..9b1356a072 100644
--- a/Koha/Library/Groups.pm
+++ b/Koha/Library/Groups.pm
@@ -49,7 +49,7 @@ sub get_root_groups {
 
 =cut
 
-sub type {
+sub _type {
     return 'LibraryGroup';
 }