diff --git a/src/robofish/evaluate/evaluate.py b/src/robofish/evaluate/evaluate.py
index f3d0e99d2f60ff1585c4bef3dcd185fd6ecc56c4..4db49e8766f255d1e0f8ab7bb7946988ca177447 100644
--- a/src/robofish/evaluate/evaluate.py
+++ b/src/robofish/evaluate/evaluate.py
@@ -321,7 +321,7 @@ def evaluate_tankpositions(paths, names=None, save_path=None, predicate=None):
         ax[i].set_xlim(-world_bounds[i][0] / 2, world_bounds[i][0] / 2)
         ax[i].set_ylim(-world_bounds[i][1] / 2, world_bounds[i][1] / 2)
 
-        sns.kdeplot(x_pos[i], y_pos[i] * (-1), n_levels=25, shade=True, ax=ax[i])
+        sns.kdeplot(x=x_pos[i], y=y_pos[i] * (-1), n_levels=25, shade=True, ax=ax[i])
 
     if save_path is None:
         plt.show()