diff --git a/htdocs/install/mysql/migration/2.9.0-3.0.0.sql b/htdocs/install/mysql/migration/2.9.0-3.0.0.sql
index 4184a5fa6fb..085d0b1db75 100644
--- a/htdocs/install/mysql/migration/2.9.0-3.0.0.sql
+++ b/htdocs/install/mysql/migration/2.9.0-3.0.0.sql
@@ -43,6 +43,7 @@ ALTER TABLE llx_expedition MODIFY date_expedition datetime;
 ALTER TABLE llx_expedition MODIFY date_delivery datetime NULL;
 
 ALTER TABLE llx_societe ADD COLUMN canvas varchar(32) DEFAULT NULL AFTER default_lang;
+ALTER TABLE llx_societe MODIFY canvas varchar(32) DEFAULT NULL;
 
 ALTER TABLE llx_cond_reglement RENAME TO llx_c_payment_term;
 ALTER TABLE llx_expedition_methode RENAME TO llx_c_shipment_mode;
@@ -93,8 +94,8 @@ CREATE TABLE llx_c_ziptown
 ALTER TABLE llx_c_ziptown ADD INDEX idx_c_ziptown_fk_county (fk_county);
 ALTER TABLE llx_c_ziptown ADD CONSTRAINT fk_c_ziptown_fk_county		FOREIGN KEY (fk_county)   REFERENCES llx_c_departements (rowid);
 
-ALTER TABLE llx_socpeople ADD COLUMN canvas	varchar(32)	DEFAULT 'default' after default_lang;
-ALTER TABLE llx_socpeople MODIFY canvas varchar(32) DEFAULT 'default';
+ALTER TABLE llx_socpeople ADD COLUMN canvas varchar(32) DEFAULT NULL after default_lang;
+ALTER TABLE llx_socpeople MODIFY canvas varchar(32) DEFAULT NULL;
 
 UPDATE llx_socpeople SET canvas = 'default' WHERE canvas = 'default@contact';
 UPDATE llx_societe SET canvas = 'default' WHERE canvas = 'default@thirdparty';
diff --git a/htdocs/install/mysql/tables/llx_societe.sql b/htdocs/install/mysql/tables/llx_societe.sql
index 4dc1a835250..d2168585a90 100644
--- a/htdocs/install/mysql/tables/llx_societe.sql
+++ b/htdocs/install/mysql/tables/llx_societe.sql
@@ -81,6 +81,6 @@ create table llx_societe
   gencod                   varchar(255),                        		-- barcode
   price_level              integer NULL,                        		-- level of price for multiprices
   default_lang             varchar(6),									-- default language
-  canvas				   varchar(32)	  DEFAULT 'default',			-- type of canvas
+  canvas				   varchar(32),			                        -- type of canvas if used (null by default)
   import_key               varchar(14)                          		-- import key
 )type=innodb;
diff --git a/htdocs/install/mysql/tables/llx_socpeople.sql b/htdocs/install/mysql/tables/llx_socpeople.sql
index eb39de0ce6d..efe3d496456 100644
--- a/htdocs/install/mysql/tables/llx_socpeople.sql
+++ b/htdocs/install/mysql/tables/llx_socpeople.sql
@@ -48,6 +48,6 @@ create table llx_socpeople
   fk_user_modif		integer,
   note				text,
   default_lang		varchar(6),
-  canvas			varchar(32)	  DEFAULT 'default',			-- type of canvas
+  canvas			varchar(32),			-- type of canvas if used (null by default)
   import_key		varchar(14)
 )type=innodb;