diff --git a/src/main.rs b/src/main.rs
index 0e70a0b..de4fc84 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -314,8 +314,8 @@ mod conf {
                     eprintln!(
                         concat!("Configuration file has outdated version.\n",
                         "Expected version field to be {} but got {}."),
+                        config_version(),
                         old_version,
-                        config_version()
                     );
                 }
                 ConfigParseError::ServeDirNotExists(dir) => {