diff --git a/src/fr/devinsy/statoolinfos/checker/PropertyChecker.java b/src/fr/devinsy/statoolinfos/checker/PropertyChecker.java
index a2a1e2b..693acd4 100644
--- a/src/fr/devinsy/statoolinfos/checker/PropertyChecker.java
+++ b/src/fr/devinsy/statoolinfos/checker/PropertyChecker.java
@@ -186,6 +186,7 @@ public class PropertyChecker
         this.serviceRules.add("host.server.distribution", STRING, PropertyMode.MANDATORY);
         this.serviceRules.add("host.server.type", "^(NANO|PHYSICAL|VIRTUAL|SHARED|CLOUD)$", PropertyMode.MANDATORY);
         this.serviceRules.add("host.provider.type", "^(HOME|HOSTEDBAY|HOSTEDSERVER|OUTSOURCED)$", PropertyMode.MANDATORY);
+        this.serviceRules.add("host.provider.hypervisor", STRING, PropertyMode.OPTIONAL);
         this.serviceRules.add("host.country.name", STRING, PropertyMode.WISHED);
         this.serviceRules.add("host.country.code", COUNTRY_CODE, PropertyMode.MANDATORY);