diff --git a/src/popt/loop/ensemble_base.py b/src/popt/loop/ensemble_base.py
index ed3ca9df..d0d38810 100644
--- a/src/popt/loop/ensemble_base.py
+++ b/src/popt/loop/ensemble_base.py
@@ -133,7 +133,7 @@ def function(self, x, *args, **kwargs):
                 self.pred_data, 
                 input_dict=self.sim.input_dict,
                 true_order=self.sim.true_order, 
-                state=matrix_to_dict(x, self.idX),
+                state=matrix_to_dict(self.invert_scale_state(x), self.idX),
                 **kwargs
             )
         else: