diff --git a/thehive/app/org/thp/thehive/services/ObservableTypeSrv.scala b/thehive/app/org/thp/thehive/services/ObservableTypeSrv.scala
index 132585dfe8..996ec7dbe9 100644
--- a/thehive/app/org/thp/thehive/services/ObservableTypeSrv.scala
+++ b/thehive/app/org/thp/thehive/services/ObservableTypeSrv.scala
@@ -35,7 +35,7 @@ class ObservableTypeSrv @Inject() (@Named("integrity-check-actor") integrityChec
       createEntity(observableType)
 
   def remove(idOrName: EntityIdOrName)(implicit graph: Graph): Try[Unit] =
-    if (isUsed(idOrName)) Success(get(idOrName).remove())
+    if (!isUsed(idOrName)) Success(get(idOrName).remove())
     else Failure(BadRequestError(s"Observable type $idOrName is used"))
 
   def isUsed(idOrName: EntityIdOrName)(implicit graph: Graph): Boolean = get(idOrName).inE[ObservableObservableType].exists