diff --git a/htdocs/asset/admin/setup.php b/htdocs/asset/admin/setup.php
index 85f8dc1e4c6..afa4777de3d 100644
--- a/htdocs/asset/admin/setup.php
+++ b/htdocs/asset/admin/setup.php
@@ -47,7 +47,7 @@ $type = 'asset';
 
 $arrayofparameters = array(
 	'ASSET_ACCOUNTANCY_CATEGORY'=>array('type'=>'accountancy_category', 'enabled'=>1),
-	//'ASSET_MYPARAM1'=>array('type'=>'string', 'css'=>'minwidth500' ,'enabled'=>1),
+	'ASSET_DEPRECIATION_DURATION_PER_YEAR'=>array('type'=>'string', 'css'=>'minwidth200', 'enabled'=>1),
 	//'ASSET_MYPARAM2'=>array('type'=>'textarea','enabled'=>1),
 	//'ASSET_MYPARAM3'=>array('type'=>'category:'.Categorie::TYPE_CUSTOMER, 'enabled'=>1),
 	//'ASSET_MYPARAM4'=>array('type'=>'emailtemplate:thirdparty', 'enabled'=>1),
diff --git a/htdocs/asset/class/asset.class.php b/htdocs/asset/class/asset.class.php
index c1ea4a130d8..7be8aa9e024 100644
--- a/htdocs/asset/class/asset.class.php
+++ b/htdocs/asset/class/asset.class.php
@@ -971,7 +971,7 @@ class Asset extends CommonObject
 
 				// futures depreciation lines
 				//-----------------------------------------------------
-				$nb_days_in_year = !empty($conf->global->ASSET_DEPRECIATION_DURATION_PER_YEAR) ? $conf->global->ASSET_DEPRECIATION_DURATION_PER_YEAR : 360;
+				$nb_days_in_year = !empty($conf->global->ASSET_DEPRECIATION_DURATION_PER_YEAR) ? $conf->global->ASSET_DEPRECIATION_DURATION_PER_YEAR : 365;
 				$nb_days_in_month = !empty($conf->global->ASSET_DEPRECIATION_DURATION_PER_MONTH) ? $conf->global->ASSET_DEPRECIATION_DURATION_PER_MONTH : 30;
 				$period_amount = (double) price2num($depreciation_period_amount / $fields['duration'], 'MT');
 				$first_period_found = false;
diff --git a/htdocs/core/modules/modAsset.class.php b/htdocs/core/modules/modAsset.class.php
index 0fe334bc846..2146de367e1 100644
--- a/htdocs/core/modules/modAsset.class.php
+++ b/htdocs/core/modules/modAsset.class.php
@@ -103,6 +103,15 @@ class modAsset extends DolibarrModules
 		//                             1=>array('ASSETS_MYNEWCONST2','chaine','myvalue','This is another constant to add',0, 'current', 1)
 		// );
 		$this->const = array();
+		$this->const[1] = array(
+			"ASSET_DEPRECIATION_DURATION_PER_YEAR",
+			"chaine",
+			"365",
+			"Duration per year to calculate depreciation. In some case, can be 360 days",
+			0,
+			'current',
+			1
+		);
 
 
 		if (!isset($conf->asset) || !isset($conf->asset->enabled)) {