diff --git a/xs/src/libslic3r/Fill/FillRectilinear.cpp b/xs/src/libslic3r/Fill/FillRectilinear.cpp
index f2e5ba7a3..8e0578c48 100644
--- a/xs/src/libslic3r/Fill/FillRectilinear.cpp
+++ b/xs/src/libslic3r/Fill/FillRectilinear.cpp
@@ -525,7 +525,7 @@ void FillCubic::_fill_surface_single(
     direction_t direction2 = direction;
     
     const coord_t range = scale_(this->min_spacing / this->density);
-    const coord_t x_shift = abs(( (coord_t)(scale_(this->z) + range) % (coord_t)(range * 2)) - range);
+    const coord_t x_shift = (coord_t)(scale_(this->z) + range) % (coord_t)(range*3);
     
     fill2._fill_single_direction(expolygon, direction2, -x_shift, out);