diff --git a/src/main.rs b/src/main.rs
index cdb62a6..7698b4e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,5 +1,5 @@
 use rusqlite::backup::{Backup, Progress};
-use rusqlite::Connection;
+use rusqlite::{Connection, OpenFlags};
 use std::env;
 use std::fs::copy;
 use std::path::Path;
@@ -19,7 +19,13 @@ fn main() {
     println!("{}", src_file.metadata().unwrap().len() / 1000);
     println!("{}", tmpfile_path.display());
 
-    let src_db = Connection::open(src_file).unwrap();
+    let src_db = Connection::open_with_flags(
+        src_file,
+        OpenFlags::SQLITE_OPEN_READ_ONLY
+            | OpenFlags::SQLITE_OPEN_NO_MUTEX
+            | OpenFlags::SQLITE_OPEN_PRIVATE_CACHE,
+    )
+    .unwrap();
 
     let mut dest_db = Connection::open(tmpfile_path).unwrap();
     {