diff --git a/src/sp-window.c b/src/sp-window.c
index 93e011c8..4a3f357d 100644
--- a/src/sp-window.c
+++ b/src/sp-window.c
@@ -724,7 +724,7 @@ zoom_level_to_string (GBinding     *binding,
                       gpointer      user_data)
 {
   gdouble percent = 100.0 * g_value_get_double (from_value);
-  g_value_take_string (to_value, g_strdup_printf ("%u%%", (guint)ceil (percent)));
+  g_value_take_string (to_value, g_strdup_printf ("%u%%", (guint)floor (percent)));
   return TRUE;
 }