diff --git a/src/legacy/ui/ui_render/bootstrap/startup.js.hbs b/src/legacy/ui/ui_render/bootstrap/startup.js.hbs
index 2a7e6f28a90b..b54e94b0b9e2 100644
--- a/src/legacy/ui/ui_render/bootstrap/startup.js.hbs
+++ b/src/legacy/ui/ui_render/bootstrap/startup.js.hbs
@@ -36,6 +36,8 @@ var themeVersion = rawThemeVersion === 'v7' ? 'v7' : 'v8';
 
 window.__osdThemeTag__ = themeVersion + darkMode;
 
+var themeSourceKey = themeVersion === 'v7' ? 'v7' : 'default';
+
 var themeSources = {{THEME_SOURCES}};
 
 var themeDefinition = themeSources[themeVersion][darkMode];
@@ -80,8 +82,8 @@ document.head.insertBefore(themedStylesDom, stylesheetTarget);
 var fontTexts = {{fontText}};
 var fontCodes = {{fontCode}};
 
-var fontText = fontTexts[themeVersion];
-var fontCode = fontCodes[themeVersion];
+var fontText = fontTexts[themeSourceKey];
+var fontCode = fontCodes[themeSourceKey];
 
 var fontTarget = document.querySelector('head meta[name="add-fonts-here"]');