diff --git a/Cargo.toml b/Cargo.toml
index 03eb08ee1..83518332f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,7 +27,7 @@ harness = false
 [[test]]
 name = "line_numbers"
 path = "tests/line_numbers.rs"
-harness = false
+harness = true
 
 [[test]]
 name = "macros"
diff --git a/tests/line_numbers.rs b/tests/line_numbers.rs
index 41fb1537d..5e075cc4f 100644
--- a/tests/line_numbers.rs
+++ b/tests/line_numbers.rs
@@ -20,9 +20,7 @@ struct State {
 struct Logger(Arc<State>);
 
 impl Log for Logger {
-    fn enabled(&self, _: &Metadata) -> bool {
-        true
-    }
+    fn enabled(&self, _: &Metadata) -> bool { true }
 
     fn log(&self, record: &Record) {
         *self.0.last_log.lock().unwrap() = record.line();
@@ -31,7 +29,7 @@ impl Log for Logger {
     fn flush(&self) {}
 }
 
-#[cfg_attr(lib_build, test)]
+#[test]
 fn main() {
     #[cfg(not(any(
         feature = "max_level_off",
@@ -53,10 +51,11 @@ fn main() {
         });
         let state = default_state.clone();
         set_boxed_logger(Box::new(Logger(default_state))).unwrap();
+
         log::set_max_level(LevelFilter::Trace);
 
         info!("");
-        check_line(&state, 58);
+        check_line(&state, 57);
     }
     fn check_line(state: &State, expected: u32) {
         let line_number = state.last_log.lock().unwrap().take().unwrap();