diff --git a/src/plots/cartesian/layout_attributes.js b/src/plots/cartesian/layout_attributes.js
index e1688ff0dcd..ccbbd8597a5 100644
--- a/src/plots/cartesian/layout_attributes.js
+++ b/src/plots/cartesian/layout_attributes.js
@@ -317,7 +317,6 @@ module.exports = {
     spikemode: {
         valType: 'flaglist',
         flags: ['toaxis', 'across', 'marker'],
-        extras: ['none'],
         role: 'style',
         dflt: 'toaxis',
         description: [