diff --git a/searx/data/wikidata_units.json b/searx/data/wikidata_units.json
index 16543c422..2c9878ff9 100644
--- a/searx/data/wikidata_units.json
+++ b/searx/data/wikidata_units.json
@@ -1201,6 +1201,7 @@
     "Q99476928": "gf",
     "Q99487704": "ppt",
     "Q99490009": "BTU (IT)",
+    "Q99490301": "BTU (ISO)",
     "Q99490479": "BTU (39 °F)",
     "Q99490986": "BTU (59 °F)",
     "Q99491193": "BTU (60 °F)",