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-rw-r--r--ganv/canvas.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ganv/canvas.h b/ganv/canvas.h
index 57781dc..a3444dc 100644
--- a/ganv/canvas.h
+++ b/ganv/canvas.h
@@ -501,7 +501,7 @@ ganv_canvas_select_all(GanvCanvas* canvas);
* Return the current zoom factor (pixels per unit).
*/
double
-ganv_canvas_get_zoom(GanvCanvas* canvas);
+ganv_canvas_get_zoom(const GanvCanvas* canvas);
/**
* ganv_canvas_set_zoom: