diff --git a/sympy/logic/boolalg.py b/sympy/logic/boolalg.py
index c4cbf0e4671a..3e3f548938ba 100644
--- a/sympy/logic/boolalg.py
+++ b/sympy/logic/boolalg.py
@@ -15,6 +15,7 @@
 from sympy.core.operations import LatticeOp
 from sympy.core.singleton import Singleton, S
 from sympy.core.sorting import ordered
+from sympy.core.symbol import Symbol
 from sympy.core.sympify import _sympy_converter, _sympify, sympify
 from sympy.utilities.iterables import sift, ibin
 from sympy.utilities.misc import filldedent