diff --git a/docker-compose.yaml b/docker-compose.yaml
index 08db5d8..89856a6 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -70,7 +70,7 @@ services:
       - CMD_LDAP_BINDDN={{ bind_user }}
       - CMD_LDAP_BINDCREDENTIALS={{ bind_password }}
       - CMD_LDAP_SEARCHBASE=OU=users,OU=psi,DC=d,DC=psi,DC=ch
-      - CMD_LDAP_SEARCHFILTER=(&(objectClass=user)(objectcategory=person))
+      - CMD_LDAP_SEARCHFILTER=(&(objectClass=user)(objectcategory=person)(sAMAccountName={{username}}))
       - CMD_LDAP_USERIDFIELD=sAMAccountName
       - CMD_LDAP_PROVIDERNAME="PSI"
     volumes: