diff --git a/setup.py b/setup.py
index a6caac784..dda2d06a2 100644
--- a/setup.py
+++ b/setup.py
@@ -253,6 +253,7 @@ sources = ["examples/pybullet/pybullet.c"]\
 +["src/BulletSoftBody/btDeformableContactConstraint.cpp"]\
 +["src/BulletSoftBody/btDeformableMultiBodyConstraintSolver.cpp"]\
 +["src/BulletSoftBody/btDeformableMultiBodyDynamicsWorld.cpp"]\
++["src/BulletSoftBody/poly34.cpp"]\
 +["src/BulletInverseDynamics/IDMath.cpp"]\
 +["src/BulletInverseDynamics/MultiBodyTree.cpp"]\
 +["src/BulletInverseDynamics/details/MultiBodyTreeImpl.cpp"]\