diff --git a/src/pyj/read_book/settings.pyj b/src/pyj/read_book/settings.pyj
index 7e05f72c65..d4004b0e37 100644
--- a/src/pyj/read_book/settings.pyj
+++ b/src/pyj/read_book/settings.pyj
@@ -19,7 +19,7 @@ update_settings()
 
 
 def apply_font_size():
-    document.documentElement.style.fontSize = document.body.style.fontSize = '{}px'.format(opts.base_font_size)
+    document.documentElement.style.fontSize = '{}px'.format(opts.base_font_size)
 
 
 def apply_colors():