diff --git a/manimlib/mobject/types/vectorized_mobject.py b/manimlib/mobject/types/vectorized_mobject.py
index fa797f4e..72f14439 100644
--- a/manimlib/mobject/types/vectorized_mobject.py
+++ b/manimlib/mobject/types/vectorized_mobject.py
@@ -131,7 +131,7 @@ class VMobject(Mobject):
     def set_fill(self, color=None, opacity=None, family=True):
         # Assume that if it was opacity 0, and set_fill
         # is called, the intent is for it to now be 1.
-        if opacity is None:
+        if opacity is None and self.get_fill_opacity() == 0:
             opacity = 1
 
         if family: