diff --git a/include/solid.hpp b/include/solid.hpp
index 23347f7..ab45504 100644
--- a/include/solid.hpp
+++ b/include/solid.hpp
@@ -32,9 +32,6 @@ protected:
     real _rScale;
     IExtrudedSolidBase(std::vector<Polyline> profiles, AxisLineType axis, real rScale)
         : _profiles(std::move(profiles)), _axis(std::move(axis)), _rScale(rScale) {}
-
-public:
-    virtual real sdf(const Vec3 &p) = 0;
 };
 
 /**