diff --git a/symfem/elements/bubble.py b/symfem/elements/bubble.py
index d5da7df..9ffabe9 100644
--- a/symfem/elements/bubble.py
+++ b/symfem/elements/bubble.py
@@ -13,7 +13,6 @@
 from symfem.functionals import DotPointEvaluation, ListOfFunctionals, PointEvaluation
 from symfem.functions import FunctionInput
 from symfem.references import Reference
-from symfem.symbols import x
 from symfem.elements.lagrange import Lagrange
 
 __all__ = ["Bubble", "BubbleEnrichedLagrange", "BubbleEnrichedVectorLagrange"]