diff --git a/src/server.rs b/src/server.rs
index 2242eb9..e3a3f84 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -827,7 +827,7 @@ async fn upload_file(
     hasher.update(input.as_bytes());
     let hash = hasher.finalize();
     let hex = format!("{:x}", hash);
-    let file_uuid = hex[0..32].to_string();
+    let file_uuid = hex.chars().take(32).collect::<String>();
 
     // Save to database (user-specific SQLite)
     let db_path = crate::filetree::FileTree::user_db_path(&user_id);