diff --git a/htdocs/install/upgrade2.php b/htdocs/install/upgrade2.php
index b2cc83d78b41dcc40d410cf23ffd12007aa8f89a..3517c3cfe16ed7df7e8d1b8fd17f4ed4fe289012 100644
--- a/htdocs/install/upgrade2.php
+++ b/htdocs/install/upgrade2.php
@@ -2674,8 +2674,7 @@ function migrate_project_task_time($db,$langs,$conf)
 				{
 					// convert to second
 					// only for int time and float time ex: 1,75 for 1h45
-					$time = floatval($obj->task_duration);
-					list($hour,$min) = explode('.',$time);
+					list($hour,$min) = explode('.',$obj->task_duration);
 					$hour = $hour*60*60;
 					$min = ($min/100)*60*60;
 					$newtime = $hour+$min;