diff --git a/src/app.rs b/src/app.rs
index e817dd45..8177d7e9 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -82,10 +82,11 @@ fn add<'a, T: Io, S: 'a + Storage>(
     Ok(())
 }
 
-fn calculate_total(io: &impl Io, d: &str, mut total: u64) -> io::Result<u64> {
+fn calculate_total(io: &impl Io, d: &str, extra: u64) -> io::Result<u64> {
     let stdout = &mut io.stdout();
     let a = io.read_dir(&("cdt0/".to_owned() + d))?;
     let an = a.len() as u64;
+    let mut total = 0;
     let state = &mut State::new(stdout);
     for (ai, ia) in a.iter().enumerate() {
         let b = io.read_dir(&ia.path())?;
@@ -97,16 +98,16 @@ fn calculate_total(io: &impl Io, d: &str, mut total: u64) -> io::Result<u64> {
                 total += d;
             }
             let p = (bn * ai as u64 + bi as u64) as f64 / (an * bn) as f64;
-            let e = (total as f64) / p;
+            let e = (extra + total) as f64 / p;
             let s = "size: ~".to_string()
-                + &mb(e as u64)
+                + &mb(extra + e as u64)
                 + ". "
                 + &((p * 100.0) as u64).to_string()
                 + "%.";
             state.set(&s)?;
         }
     }
-    Ok(total)
+    Ok(extra + total)
 }
 
 pub fn run(io: &impl Io) -> Result<(), String> {