diff --git a/pertpy/tools/_distances/_distances.py b/pertpy/tools/_distances/_distances.py
index 70d1096b..0d09ccc2 100644
--- a/pertpy/tools/_distances/_distances.py
+++ b/pertpy/tools/_distances/_distances.py
@@ -363,7 +363,7 @@ def solve_ot_problem(self, geom: Geometry, **kwargs):
         solver = Sinkhorn()
         # Solve OT problem
         ot = solver(ot_prob, **kwargs)
-        return ot.reg_ot_cost
+        return ot.reg_ot_cost.item()
 
 
 class PseudobulkDistance(AbstractDistance):