diff --git a/kissim/viewer/kinase.py b/kissim/viewer/kinase.py
index 9034c1ea..83e8b8c6 100644
--- a/kissim/viewer/kinase.py
+++ b/kissim/viewer/kinase.py
@@ -76,7 +76,7 @@ def from_kinase_klifs_id(
     @property
     def _std(self):
 
-        return self._fingerprints_features.std(level="residue_ix")
+        return self._fingerprints_features.groupby("residue_ix").std()
 
     def residue_to_color_mapping(self, feature_name, fingerprint, plot_cmap=False):
         """