diff --git a/lib/redmine/helpers/gantt.rb b/lib/redmine/helpers/gantt.rb
index 206cdea24..cb3d519d4 100644
--- a/lib/redmine/helpers/gantt.rb
+++ b/lib/redmine/helpers/gantt.rb
@@ -520,7 +520,7 @@ module Redmine
           end
         end
         g_width = PDF.right_pane_width
-        zoom = (g_width) / (self.date_to - self.date_from + 1)
+        zoom = g_width / (self.date_to - self.date_from + 1)
         g_height = 120
         t_height = g_height + headers_height
         y_start = pdf.GetY