diff --git a/src/containers/blocks.jsx b/src/containers/blocks.jsx
index f281e706b3be2092aed03a28c04c8cd2e95dc6a5..dcdc8413eb3bb98535ee2e04f2eb1bd2d5987683 100644
--- a/src/containers/blocks.jsx
+++ b/src/containers/blocks.jsx
@@ -231,9 +231,9 @@ class Blocks extends React.Component {
     setBlocks (blocks) {
         this.blocks = blocks;
     }
-    handlePromptStart (message, defaultValue, callback, opt_title) {
-        var p = {prompt: {callback, message, defaultValue}};
-        p.prompt.title = opt_title ? opt_title : "New Variable";
+    handlePromptStart (message, defaultValue, callback, optTitle) {
+        const p = {prompt: {callback, message, defaultValue}};
+        p.prompt.title = optTitle ? optTitle : 'New Variable';
         this.setState(p);
     }
     handlePromptCallback (data) {