diff --git a/libs/plotly/plotly-layout.model.ts b/libs/plotly/plotly-layout.model.ts
index 392e2eee046be72826d5183b0e825e012b853c80..94b1dcd630ec85fb3576743a9ea6117a1e5b936d 100644
--- a/libs/plotly/plotly-layout.model.ts
+++ b/libs/plotly/plotly-layout.model.ts
@@ -8,13 +8,12 @@ import {
 } from 'plotly.js';
 
 export interface PlotlyLayout extends Partial<Layout> {
-  /** x-axis */
-  xaxis: Partial<PlotlyAxis>;
-  /** y-axis */
-  yaxis: Partial<PlotlyAxis>;
-
   /** Aspect ratio of plot */
   aspectRatio?: string;
+  /** x-axis */
+  xaxis?: Partial<PlotlyAxis>;
+  /** y-axis */
+  yaxis?: Partial<PlotlyAxis>;
 }
 
 /**