diff --git a/src/calibre/gui2/viewer/main.py b/src/calibre/gui2/viewer/main.py
index 8e1b6163b2..494683d88b 100644
--- a/src/calibre/gui2/viewer/main.py
+++ b/src/calibre/gui2/viewer/main.py
@@ -1119,7 +1119,7 @@ class EbookViewer(MainWindow, Ui_EbookViewer):
                 event.accept()
                 return
             if self.isFullScreen():
-                self.toggle_fullscreen()
+                self.action_full_screen.trigger()
                 event.accept()
                 return
         try: