diff --git a/src/browser/components/preferences/zen-settings.js b/src/browser/components/preferences/zen-settings.js
index c71f94f0f..8c553d4d4 100644
--- a/src/browser/components/preferences/zen-settings.js
+++ b/src/browser/components/preferences/zen-settings.js
@@ -230,7 +230,7 @@ var gZenMarketplaceManager = {
       `);
 
       const themeName = `${theme.name} (v${theme.version || '1.0.0'})`;
-      const sanitizedName = theme.name?.replaceAll(/\s/g, '-')?.replaceAll(/[^A-z_-]+/g, '');
+      const sanitizedName = `theme-${theme.name?.replaceAll(/\s/g, '-')?.replaceAll(/[^A-z_-]+/g, '')}`;
 
       const base = fragment.querySelector('.zenThemeMarketplaceItem');
       const baseHeader = fragment.querySelector('#zenThemeMarketplaceItemContentHeader');