diff --git a/openerp-server-installer.nsi b/openerp-server-installer.nsi
index 2d03ec8b8c6..3a5b7f7fb78 100644
--- a/openerp-server-installer.nsi
+++ b/openerp-server-installer.nsi
@@ -91,10 +91,11 @@ Var STARTMENU_FOLDER
 Section "OpenERP Server" SecOpenERPServer
     ClearErrors
     ReadRegStr $0 HKCU "Software\OpenERP Server" ""
-    IfErrors +2 0
+    IfErrors DoInstall 0
         MessageBox MB_OK "Can't install this version of OpenERP Server because there is a previous installation on this system !"
         Quit
 
+    DoInstall:
     nsExec::Exec "net stop openerp-service"
     sleep 2