diff --git a/src/curation/upheno-config.yaml b/src/curation/upheno-config.yaml
index 94046746..1c567f51 100644
--- a/src/curation/upheno-config.yaml
+++ b/src/curation/upheno-config.yaml
@@ -250,7 +250,7 @@ sources:
       #- ncit
   - id: zp
     mirror_from: http://purl.obolibrary.org/obo/zp/zp-base.owl
-    root: http://purl.obolibrary.org/obo/ZP_00000000
+    root: http://purl.obolibrary.org/obo/ZP_0000000
     prefix_iri: http://purl.obolibrary.org/obo/ZP_
     taxon: http://purl.obolibrary.org/obo/UPHENO_ZP
     taxon_label: ZPO
diff --git a/src/ontology/upheno-odk.yaml b/src/ontology/upheno-odk.yaml
index 5bf12cd8..a1e71250 100644
--- a/src/ontology/upheno-odk.yaml
+++ b/src/ontology/upheno-odk.yaml
@@ -195,7 +195,7 @@ sources:
       #- ncit
   - id: zp
     mirror_from: http://purl.obolibrary.org/obo/zp/zp-base.owl
-    root: http://purl.obolibrary.org/obo/ZP_00000000
+    root: http://purl.obolibrary.org/obo/ZP_0000000
     prefix_iri: http://purl.obolibrary.org/obo/ZP_
     taxon: http://purl.obolibrary.org/obo/ZP
     taxon_label: ZPO
diff --git a/src/sparql/zp_phenotypes.sparql b/src/sparql/zp_phenotypes.sparql
index 851a6118..526984ca 100644
--- a/src/sparql/zp_phenotypes.sparql
+++ b/src/sparql/zp_phenotypes.sparql
@@ -4,7 +4,7 @@ prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
 
 SELECT ?s ?lab ?ldef WHERE 
 {
-?s rdfs:subClassOf* <http://purl.obolibrary.org/obo/ZP_00000000> . 
+?s rdfs:subClassOf* <http://purl.obolibrary.org/obo/ZP_0000000> . 
 OPTIONAL { ?s rdfs:label ?lab }
 OPTIONAL { ?s owl:equivalentClass [ rdf:type owl:Restriction ;
 owl:onProperty <http://purl.obolibrary.org/obo/BFO_0000051> ;