diff --git a/src/bin/main.rs b/src/bin/main.rs
index 53cd61c..c88e986 100644
--- a/src/bin/main.rs
+++ b/src/bin/main.rs
@@ -123,7 +123,12 @@ fn main() {
                 eprintln!("{}", err);
                 Box::new(Ctr::String("<prompt broken!>".to_string()))
             });
-        let p_str = s.to_string();
+        let p_str: String;
+        if let Ctr::String(s) = s {
+            p_str = s;
+        } else {
+            p_str = s.to_string();
+        }
         let readline_prompt = CustomPrompt(p_str.as_str());
 
         let user_doc = rl.read_line(&readline_prompt).unwrap();