diff --git a/modules/Migration/views/Index.php b/modules/Migration/views/Index.php
index 5d6d9756d..b62bf6fe5 100644
--- a/modules/Migration/views/Index.php
+++ b/modules/Migration/views/Index.php
@@ -116,6 +116,9 @@ public function applyDBChanges(){
 
 		define('VTIGER_UPGRADE', true);
 
+		// migrationでは重い処理の可能性もあるため処理時間は無限にする
+		set_time_limit(0);
+
 		for($i=0; $i<$patchCount; $i++){
 			$filename =  "modules/Migration/schema/".$migrateVersions[$i]."_to_".$migrateVersions[$i+1].".php";
 			if(is_file($filename)) {