diff --git a/Demos/UserCollisionAlgorithm/CMakeLists.txt b/Demos/UserCollisionAlgorithm/CMakeLists.txt
index d0aa6703e..b9b21695e 100644
--- a/Demos/UserCollisionAlgorithm/CMakeLists.txt
+++ b/Demos/UserCollisionAlgorithm/CMakeLists.txt
@@ -57,6 +57,5 @@ LibCcdPhysicsInterface LibOpenGLSupport LibBulletDynamics LibPhysicsCommonInterf
 
 ADD_EXECUTABLE(UserCollisionAlgorithm
 	UserCollisionAlgorithm.cpp
-	SphereSphereCollisionAlgorithm.cpp
 )