diff --git a/src/main.rs b/src/main.rs
index 0971c3e..504d819 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -17,7 +17,7 @@ struct ServantArgs {
     #[arg(long)]
     serve_dir: String,
 
-    #[arg(long)]
+    #[arg(long, default_value_t = String::from("index.html"))]
     index_file: String,
 }