diff --git a/src/gui/MainWindow.cpp b/src/gui/MainWindow.cpp
index cccc7bd39..b8ddd6071 100644
--- a/src/gui/MainWindow.cpp
+++ b/src/gui/MainWindow.cpp
@@ -830,8 +830,13 @@ bool MainWindow::saveProjectAs()
 	if( sfd.exec () == FileDialog::Accepted &&
 		!sfd.selectedFiles().isEmpty() && sfd.selectedFiles()[0] != "" )
 	{
+		QString fname = sfd.selectedFiles()[0] ;
+		if( sfd.selectedNameFilter().contains( "(*.mpt)" ) && !sfd.selectedFiles()[0].endsWith( ".mpt" ) )
+		{
+			fname += ".mpt";
+		}
 		Engine::getSong()->guiSaveProjectAs(
-						sfd.selectedFiles()[0] );
+						fname );
 		return( true );
 	}
 	return( false );