diff --git a/src/ontology/doid-idranges.owl b/src/ontology/doid-idranges.owl
index fb205af4..68bc6ba9 100644
--- a/src/ontology/doid-idranges.owl
+++ b/src/ontology/doid-idranges.owl
@@ -29,8 +29,7 @@ Datatype: idrange:1
         allocatedto: "Lynn Schriml"
     
     EquivalentTo: 
-        xsd:integer[> 0050000 , <= 0050999]
-       
+        xsd:integer[> 0051000 , <= 0052999]
 
 Datatype: idrange:2