diff --git a/rtgui/rtwindow.cc b/rtgui/rtwindow.cc
index 8cfeb8ec0..fc315e1b7 100644
--- a/rtgui/rtwindow.cc
+++ b/rtgui/rtwindow.cc
@@ -99,6 +99,8 @@ RTWindow::RTWindow ()
     , bpanel (nullptr)
     , splash (nullptr)
     , btn_fullscreen (nullptr)
+    , iFullscreen (nullptr)
+    , iFullscreen_exit (nullptr)
     , epanel (nullptr)
     , fpanel (nullptr)
 {