diff --git a/geom/geom/inc/TGeoTessellated.h b/geom/geom/inc/TGeoTessellated.h
index 85f0c9aee6cd1..062b613d1c2f9 100644
--- a/geom/geom/inc/TGeoTessellated.h
+++ b/geom/geom/inc/TGeoTessellated.h
@@ -42,7 +42,6 @@ class TGeoFacet {
 
    int operator[](int ivert) const { return fIvert[ivert]; }
    static int CompactFacet(Vertex_t *vert, int nvertices);
-   Vertex_t ComputeNormal(bool &degenerated) const;
    int GetNvert() const { return fNvert; }
 
    void Flip()