diff --git a/pfp_api/templates/person.j2 b/pfp_api/templates/person.j2
index a8f9b2d..2d962b5 100644
--- a/pfp_api/templates/person.j2
+++ b/pfp_api/templates/person.j2
@@ -1,6 +1,7 @@
 PREFIX crm: <http://www.cidoc-crm.org/cidoc-crm/>
 PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+PREFIX pfp: <https://www.oeaw.ac.at/acdh/pfp/>
 SELECT ?subject
 WHERE {
-  ?subject proxy_for <{{ person_id }}> .
+  ?subject pfp:proxy_for <{{ person_id }}> .
 }