diff --git a/data/core/synthese.sql b/data/core/synthese.sql
index 7f89379a13..e77b8da5c8 100644
--- a/data/core/synthese.sql
+++ b/data/core/synthese.sql
@@ -113,7 +113,7 @@ CREATE TABLE synthese (
     id_nomenclature_naturalness integer DEFAULT get_default_nomenclature_value('NATURALITE'),
     id_nomenclature_exist_proof integer DEFAULT get_default_nomenclature_value('PREUVE_EXIST'),
     id_nomenclature_valid_status integer DEFAULT get_default_nomenclature_value('STATUT_VALID'),
-    id_nomenclature_diffusion_level integer DEFAULT get_default_nomenclature_value('NIV_PRECIS'),
+    id_nomenclature_diffusion_level integer,
     id_nomenclature_life_stage integer DEFAULT get_default_nomenclature_value('STADE_VIE'),
     id_nomenclature_sex integer DEFAULT get_default_nomenclature_value('SEXE'),
     id_nomenclature_obj_count integer DEFAULT get_default_nomenclature_value('OBJ_DENBR'),
diff --git a/data/migrations/2.5.5to2.6.0.sql b/data/migrations/2.5.5to2.6.0.sql
index 6d21c3cb3f..cd6b8132a8 100644
--- a/data/migrations/2.5.5to2.6.0.sql
+++ b/data/migrations/2.5.5to2.6.0.sql
@@ -108,10 +108,13 @@ BEGIN;
     ALTER TABLE ONLY gn_synthese.synthese
         ADD CONSTRAINT fk_synthese_id_nomenclature_biogeo_status FOREIGN KEY (id_nomenclature_biogeo_status) REFERENCES ref_nomenclatures.t_nomenclatures(id_nomenclature) ON UPDATE CASCADE;
 
-    -- suppression de la valeur par defaut du champ id_nomenclature_sensitivity
+    -- suppression de la valeur par defaut du champ id_nomenclature_sensitivity et id_nomenclature_diffusion_level
     ALTER TABLE gn_synthese.synthese 
     ALTER column id_nomenclature_sensitivity DROP DEFAULT;
 
+    ALTER TABLE gn_synthese.synthese 
+    ALTER column id_nomenclature_diffusion_level DROP DEFAULT;
+
     CREATE OR REPLACE FUNCTION gn_synthese.fct_tri_cal_sensi_diff_level_on_each_statement() RETURNS TRIGGER
       LANGUAGE plpgsql
       AS $$