diff --git a/xs/src/libslic3r/Fill/FillRectilinear.cpp b/xs/src/libslic3r/Fill/FillRectilinear.cpp
index d27ea844c..cc7b0ca13 100644
--- a/xs/src/libslic3r/Fill/FillRectilinear.cpp
+++ b/xs/src/libslic3r/Fill/FillRectilinear.cpp
@@ -1,4 +1,3 @@
-#undef NDEBUG
 #include "../ClipperUtils.hpp"
 #include "../ExPolygon.hpp"
 #include "../PolylineCollection.hpp"