diff --git a/inventory_provider/db/opsdb.py b/inventory_provider/db/opsdb.py
index 579a8c66127736166f655272d86bb5a282018196..2768a9ed93549420757e9743dd9c023716bc6a6b 100644
--- a/inventory_provider/db/opsdb.py
+++ b/inventory_provider/db/opsdb.py
@@ -419,7 +419,7 @@ WHERE
         if row['router_name'].startswith('sw'):
             return False
         if row['pop_city'].lower() == 'slough' \
-                and row['equipment_model'].upper().startswith('MX'):
+                and not row['equipment_model'].upper().startswith('MX'):
             return False
         return True