diff --git a/lib/awful/widget/graph.lua b/lib/awful/widget/graph.lua
index be958724..abe464fb 100644
--- a/lib/awful/widget/graph.lua
+++ b/lib/awful/widget/graph.lua
@@ -224,8 +224,10 @@ end
 for _, prop in ipairs(properties) do
     if not graph["set_" .. prop] then
         graph["set_" .. prop] = function(_graph, value)
-            data[_graph][prop] = value
-            _graph:emit_signal("widget::updated")
+            if data[_graph][prop] ~= value then
+                data[_graph][prop] = value
+                _graph:emit_signal("widget::updated")
+            end
             return _graph
         end
     end