diff --git a/numina/array/trace/tests/test_trace.py b/numina/array/trace/tests/test_trace.py
index <HASH>..<HASH> 100644
--- a/numina/array/trace/tests/test_trace.py
+++ b/numina/array/trace/tests/test_trace.py
@@ -59,10 +59,9 @@ def test_trace_simple():
     assert_allclose(mm, result)
 
 
-@pytest.mark.xfail(reason='bug 27')
 def test_trace_bug_27():
     '''Trace doesn't work with a flat peak'''
     arr = np.zeros((100, 100))
     arr[47:52,12:90] = 100.0
     mm = trace(arr, 50, 50)
-    assert mm.shape[0] >= 1
\ No newline at end of file
+    assert mm.shape[0] >= 1
Remove xfail mark (bug has been fixed)