diff --git a/mobject/vectorized_mobject.py b/mobject/vectorized_mobject.py
index e00325d6..ba5cb6db 100644
--- a/mobject/vectorized_mobject.py
+++ b/mobject/vectorized_mobject.py
@@ -224,7 +224,7 @@ class VMobject(Mobject):
             self.submobjects
         )
 
-    def apply_function(self, function, maintain_smoothness = True):
+    def apply_function(self, function, maintain_smoothness = False):
         Mobject.apply_function(self, function)
         if maintain_smoothness and self.considered_smooth:
             self.make_smooth()
diff --git a/topics/number_line.py b/topics/number_line.py
index a5e1d576..fd5157ca 100644
--- a/topics/number_line.py
+++ b/topics/number_line.py
@@ -279,6 +279,9 @@ class NumberPlane(VMobject):
                 mob.make_smooth()
         return self
 
+    def apply_function(self, function, maintain_smoothness = True):
+        SVGMobject.apply_function(self, function, maintain_smoothness = maintain_smoothness)
+