diff --git a/edit/codemirror-editing-hooks.js b/edit/codemirror-editing-hooks.js
index fbfcc244..358aca88 100644
--- a/edit/codemirror-editing-hooks.js
+++ b/edit/codemirror-editing-hooks.js
@@ -482,7 +482,7 @@ onDOMscriptReady('/codemirror.js').then(() => {
     if (!chrome.runtime.getPackageDirectoryEntry) {
       const themes = [
         chrome.i18n.getMessage('defaultTheme'),
-        /* populate-theme-start*/
+        /* populate-theme-start */
         '3024-day',
         '3024-night',
         'abcdef',
diff --git a/tools/update-codemirror-themes.js b/tools/update-codemirror-themes.js
index fd6ca447..c5debd48 100644
--- a/tools/update-codemirror-themes.js
+++ b/tools/update-codemirror-themes.js
@@ -19,7 +19,7 @@ function replaceThemes(content, themes) {
   return content.replace(
     /\/\*\s*populate-theme-start\s*\*\/[\s\S]+\/\*\s*populate-theme-end\s*\*\//,
     // strip off square brackets & first 8 spaces
-    `/* populate-theme-start*/\n${list.substring(2, list.length - 2)}\n        /* populate-theme-end */`
+    `/* populate-theme-start */\n${list.substring(2, list.length - 2)}\n        /* populate-theme-end */`
   );
 }