diff --git a/src/calibre/gui2/progress_indicator/QProgressIndicator.cpp b/src/calibre/gui2/progress_indicator/QProgressIndicator.cpp
index 66f9da481c..a2cd9863f6 100644
--- a/src/calibre/gui2/progress_indicator/QProgressIndicator.cpp
+++ b/src/calibre/gui2/progress_indicator/QProgressIndicator.cpp
@@ -438,6 +438,6 @@ set_menu_on_action(QAction* ac, QMenu* menu) {
 }
 
 QMenu*
-menu_for_action(QAction *ac) {
+menu_for_action(const QAction *ac) {
     return ac->menu<QMenu*>();
 }
diff --git a/src/calibre/gui2/progress_indicator/QProgressIndicator.h b/src/calibre/gui2/progress_indicator/QProgressIndicator.h
index ccef8130b0..9cc5459abf 100644
--- a/src/calibre/gui2/progress_indicator/QProgressIndicator.h
+++ b/src/calibre/gui2/progress_indicator/QProgressIndicator.h
@@ -142,4 +142,4 @@ int load_style(const QHash<unsigned long,QString> &icon_map, int transient_scrol
 void set_no_activate_on_click(QWidget *widget);
 void draw_snake_spinner(QPainter &painter, QRect rect, int angle, const QColor & light, const QColor & dark);
 void set_menu_on_action(QAction* ac, QMenu* menu);
-QMenu* menu_for_action(QAction *ac);
+QMenu* menu_for_action(const QAction *ac);
diff --git a/src/calibre/gui2/progress_indicator/QProgressIndicator.sip b/src/calibre/gui2/progress_indicator/QProgressIndicator.sip
index 93d8096234..55e50d2ade 100644
--- a/src/calibre/gui2/progress_indicator/QProgressIndicator.sip
+++ b/src/calibre/gui2/progress_indicator/QProgressIndicator.sip
@@ -87,4 +87,4 @@ int load_style(SIP_PYDICT icon_map_, int transient_scroller);
 void set_no_activate_on_click(QWidget *widget);
 void draw_snake_spinner(QPainter &painter, QRect rect, int angle, const QColor & light, const QColor & dark) /ReleaseGIL/;
 void set_menu_on_action(QAction* ac, QMenu* menu);
-QMenu* menu_for_action(QAction *ac);
+QMenu* menu_for_action(const QAction *ac);