diff --git a/src/pyj/read_book/settings.pyj b/src/pyj/read_book/settings.pyj
index 01c840ce2f..004dd02655 100644
--- a/src/pyj/read_book/settings.pyj
+++ b/src/pyj/read_book/settings.pyj
@@ -49,13 +49,14 @@ def apply_colors():
 
 
 def apply_stylesheet():
-    if opts.user_stylesheet:
-        sid = 'calibre-browser-viewer-user-stylesheet'
-        style = document.getElementById(sid)
-        if not style:
-            style = E.style(type='text/css', id=sid)
-            document.documentElement.appendChild(style)
-        style.textContent = opts.user_stylesheet
+    sid = 'calibre-browser-viewer-user-stylesheet'
+    style = document.getElementById(sid)
+    if not style:
+        if not opts.user_stylesheet:
+            return
+        style = E.style(type='text/css', id=sid)
+        document.documentElement.appendChild(style)
+    style.textContent = opts.user_stylesheet
 
 
 def apply_settings():