diff --git a/cave_data/1626-309.html b/cave_data/1626-309.html
index d59d53371..93b5a4311 100644
--- a/cave_data/1626-309.html
+++ b/cave_data/1626-309.html
@@ -23,7 +23,7 @@ the form documented at
 <area>1626</area>
 <kataster_code></kataster_code>
 <kataster_number>309</kataster_number> 
-<unofficial_number>casino-01</unofficial_number>
+<unofficial_number></unofficial_number>
 
 <entrance>
   <entranceslug>1626-309</entranceslug>