diff --git a/fileformats/vendor/sqlite3/application.py b/fileformats/vendor/sqlite3/application.py
index be855fae..c39a84a3 100644
--- a/fileformats/vendor/sqlite3/application.py
+++ b/fileformats/vendor/sqlite3/application.py
@@ -5,7 +5,8 @@
 class Sqlite3Db(WithMagicNumber, BinaryFile):
     """SQLite3 database files."""
 
-    ext = ".db"
+    ext = ".sqlite3"
+    alternate_exts = (".sqlite", ".db", ".db3")
     # First 16 bytes: "SQLite format 3\0"
     magic_number = b"SQLite format 3\0"
     iana_mime = "application/vnd.sqlite3"