diff --git a/src/libslic3r/CutSurface.cpp b/src/libslic3r/CutSurface.cpp
index e8f2f3caf6..4ab5fa9025 100644
--- a/src/libslic3r/CutSurface.cpp
+++ b/src/libslic3r/CutSurface.cpp
@@ -2620,6 +2620,7 @@ void priv::store(const SurfaceCuts &cut, const std::string &dir) {
             }
             // triangle with indices vi1 and vi2 doesnt exist
             assert(false);
+            return Vec3f::Zero();
         };
 
         indexed_triangle_set result;