diff --git a/lib/xmet/db.py b/lib/xmet/db.py
index 4e18e27..9e8d5eb 100644
--- a/lib/xmet/db.py
+++ b/lib/xmet/db.py
@@ -112,7 +112,9 @@ class Database():
         db.row_factory = sqlite3.Row
         db.enable_load_extension(True)
 
-        db.execute("select load_extension('mod_spatialite.so.8')")
+        db.execute("select load_extension(:ext)", {
+            'ext': 'mod_spatialite.so.8'
+        })
 
         return Database(db)