diff --git a/src/pageinstall.cpp b/src/pageinstall.cpp
index 09c7308..a826a8c 100644
--- a/src/pageinstall.cpp
+++ b/src/pageinstall.cpp
@@ -106,7 +106,7 @@ void PageInstall::show()
 		m_clProc->setStandardErrorFile("/var/log/calculate/cl-install-gui-err.log");
 		//m_clProc->setStandardOutputFile("/home/guest/cl-install-gui-out.log");
 
-		m_clProc->start( "cl-install -f --color never " +  args.join(" ") );
+		m_clProc->start( "cl-install -f --color never -P " +  args.join(" ") );
 
 		m_Progress->setMinimum(0);
 		m_Progress->setMaximum(0);