diff --git a/nmma/joint/conversion.py b/nmma/joint/conversion.py
index 5536086b..636be563 100644
--- a/nmma/joint/conversion.py
+++ b/nmma/joint/conversion.py
@@ -202,10 +202,10 @@ def ejecta_parameter_conversion(self, converted_parameters, added_keys):
         chi_eff = (mass_1_source * chi_1 + mass_2_source * chi_2) / total_mass_source
 
         mdyn_fit = self.dynamic_mass_fitting(
-            mass_1_source, mass_2_source, compactness_2, chi_eff
+            mass_1_source, mass_2_source, compactness_2, chi_1
         )
         remnant_disk_fit = self.remnant_disk_mass_fitting(
-            mass_1_source, mass_2_source, compactness_2, chi_eff
+            mass_1_source, mass_2_source, compactness_2, chi_1
         )
         mdisk_fit = remnant_disk_fit - mdyn_fit