diff --git a/parser/parser-phonopy/PhononModulesNomad.py b/parser/parser-phonopy/PhononModulesNomad.py
index a2a59fd74d6c8edb0285834046e93ee47a22eec3..464b617870cc27c89d41e990bb57c81fcbbe5b6b 100644
--- a/parser/parser-phonopy/PhononModulesNomad.py
+++ b/parser/parser-phonopy/PhononModulesNomad.py
@@ -390,8 +390,8 @@ class Get_Properties():
 
     def prep_ref(self, ref_list, Emit):
         sCalc = Emit.openSection("section_calculation_to_calculation_refs")
+        Emit.addValue("calculation_to_calculation_kind", "source_calculation")
         for ref in ref_list:
-            Emit.addValue("calculation_to_calculation_kind", "source_calculation")
             Emit.addValue("calculation_to_calculation_external_url", ref)
         Emit.closeSection("section_calculation_to_calculation_refs", sCalc)