diff --git a/src/cmd_decrypt.rs b/src/cmd_decrypt.rs
index 125cc95..53b44dc 100644
--- a/src/cmd_decrypt.rs
+++ b/src/cmd_decrypt.rs
@@ -105,10 +105,10 @@ pub fn decrypt(cmd_decrypt: CmdDecrypt) -> XResult<()> {
                 if len > 0 {
                     total_len += len;
                     success!(
-                        "Decrypt {} succeed, cost {} ms, file size {}",
+                        "Decrypt {} succeed, cost {} ms{}",
                         path.to_str().unwrap_or("N/A"),
                         start_decrypt_single.elapsed().as_millis(),
-                        util_size::get_display_size(len as i64)
+                        iff!(len <= 0, "".to_string(), format!(", file size {}", util_size::get_display_size(len as i64)))
                     );
                 }
             }