diff --git a/pysaliency/datasets.py b/pysaliency/datasets.py
index a158c12..856a460 100644
--- a/pysaliency/datasets.py
+++ b/pysaliency/datasets.py
@@ -476,8 +476,8 @@ def __init__(self, train_xs, train_ys, train_ts, train_ns, train_subjects, scanp
 
         if attributes is None:
             attributes = {}
-        else:
-            warnings.warn("don't use attributes for FixationTrains, use scanpath_attributes or scanpath_fixation_attributes instead!")
+        elif attributes:
+            warnings.warn("don't use attributes for FixationTrains, use scanpath_attributes or scanpath_fixation_attributes instead!", stacklevel=2)
 
         self.auto_attributes = []