diff --git a/app/models/ems_refresh/save_inventory_infra.rb b/app/models/ems_refresh/save_inventory_infra.rb
index 30c15a6fd8d7..3b53d97250b4 100644
--- a/app/models/ems_refresh/save_inventory_infra.rb
+++ b/app/models/ems_refresh/save_inventory_infra.rb
@@ -64,7 +64,7 @@ def save_ems_infra_inventory(ems, hashes, target = nil, disconnect = true)
       :orchestration_templates,
       :orchestration_stacks
     ]
-
+    old_switch_ids = ems.switches.pluck(:id)
     # Save and link other subsections
     save_child_inventory(ems, hashes, child_keys, target, disconnect)
 
@@ -78,7 +78,7 @@ def save_ems_infra_inventory(ems, hashes, target = nil, disconnect = true)
 
     new_relats = hashes_relats(hashes)
     link_ems_inventory(ems, target, prev_relats, new_relats, disconnect)
-    remove_obsolete_switches
+    remove_obsolete_switches(old_switch_ids)
 
     ems
   end
@@ -331,10 +331,11 @@ def save_switches_inventory(host, hashes)
     host.switches.delete(deletes)
   end
 
-  def remove_obsolete_switches
+  def remove_obsolete_switches(old_switch_ids)
     # delete from switches as s where s.shared is NULL and s.id not in (select switch_id from host_switches)
     # delete from switches as s where s.shared = 't' and s.id not in (select switch_id from host_switches)
-    Switch.where.not(:id => HostSwitch.all.collect(&:switch).uniq).destroy_all
+    obsolete_switch_ids = old_switch_ids - HostSwitch.all.collect(&:switch_id)
+    Switch.where(:id => obsolete_switch_ids).destroy_all
   end
 
   def save_lans_inventory(switch, hashes)