diff --git a/src/components/Board/Output/Output.container.js b/src/components/Board/Output/Output.container.js
index 0155fbfaf..ea3b4827c 100644
--- a/src/components/Board/Output/Output.container.js
+++ b/src/components/Board/Output/Output.container.js
@@ -230,9 +230,11 @@ export class OutputContainer extends Component {
   };
 
   handleRepeatLastSpokenSentence = event => {
+    const Z_KEY_CODE = 90;
+    const Y_KEY_CODE = 89;
     if (
-      (event.ctrlKey && event.shiftKey && event.keyCode === 90) ||
-      (event.ctrlKey && event.keyCode === 89)
+      (event.ctrlKey && event.shiftKey && event.keyCode === Z_KEY_CODE) ||
+      (event.ctrlKey && event.keyCode === Y_KEY_CODE)
     ) {
       const { output } = this.props;
       const lastSpokenSymbol = output.findLast(