diff --git a/manimlib/mobject/svg/text_mobject.py b/manimlib/mobject/svg/text_mobject.py
index 492173a7..002c8a48 100644
--- a/manimlib/mobject/svg/text_mobject.py
+++ b/manimlib/mobject/svg/text_mobject.py
@@ -147,7 +147,7 @@ class MarkupText(StringMobject):
             self.set_color_by_gradient(*gradient)
         if self.t2c:
             self.set_color_by_text_to_color_map(self.t2c)
-        if self.height is None:
+        if height is None:
             self.scale(TEXT_MOB_SCALE_FACTOR)
 
     @property