diff --git a/xs/src/libslic3r/Surface.hpp b/xs/src/libslic3r/Surface.hpp
index fdd827772..2668dcabd 100644
--- a/xs/src/libslic3r/Surface.hpp
+++ b/xs/src/libslic3r/Surface.hpp
@@ -24,10 +24,6 @@ inline SurfaceType operator|=(SurfaceType& a, SurfaceType b)
 { a = a | b; return a;}
 inline SurfaceType operator&=(SurfaceType& a, SurfaceType b)
 { a = a & b; return a;}
-inline bool operator==(SurfaceType a, SurfaceType b)
-{return static_cast<uint16_t>(a) ^ static_cast<uint16_t>(b) == 0;}
-inline bool operator!=(SurfaceType a, SurfaceType b)
-{return static_cast<uint16_t>(a) ^ static_cast<uint16_t>(b) != 0;}
 
 class Surface
 {