diff --git a/htdocs/install/upgrade.php b/htdocs/install/upgrade.php
index 126c0896c80..359980763b0 100644
--- a/htdocs/install/upgrade.php
+++ b/htdocs/install/upgrade.php
@@ -57,8 +57,8 @@ $setuplang=GETPOST("selectlang",'',3)?GETPOST("selectlang",'',3):'auto';
 $langs->setDefaultLang($setuplang);
 $versionfrom=GETPOST("versionfrom",'',3)?GETPOST("versionfrom",'',3):(empty($argv[1])?'':$argv[1]);
 $versionto=GETPOST("versionto",'',3)?GETPOST("versionto",'',3):(empty($argv[2])?'':$argv[2]);
-$dirmodule=GETPOST("dirmodule",'',3)?GETPOST("dirmodule",'',3):(empty($argv[3])?'':$argv[3]);
-$ignoredbversion=GETPOST('ignoredbversion','',3)?GETPOST('ignoredbversion','',3):(empty($argv[3])?'':$argv[3]);
+$dirmodule=((GETPOST("dirmodule",'',3) && GETPOST("dirmodule",'',3) != 'ignoredbversion'))?GETPOST("dirmodule",'',3):((empty($argv[3]) || $argv[3] == 'ignoredbversion')?'':$argv[3]);
+$ignoredbversion=(GETPOST('ignoredbversion','',3)=='ignoredbversion')?GETPOST('ignoredbversion','',3):((empty($argv[3]) || $argv[3] != 'ignoredbversion')?'':$argv[3]);
 
 $langs->load("admin");
 $langs->load("install");