diff --git a/src/libslic3r/Fill/Lightning/Generator.cpp b/src/libslic3r/Fill/Lightning/Generator.cpp
index 75ca5583e..ce527d351 100644
--- a/src/libslic3r/Fill/Lightning/Generator.cpp
+++ b/src/libslic3r/Fill/Lightning/Generator.cpp
@@ -36,7 +36,9 @@ Generator::Generator(const PrintObject &print_object, const std::function<void()
     // Note: There's not going to be a layer below the first one, so the 'initial layer height' doesn't have to be taken into account.
     const double               layer_thickness      = scaled<double>(object_config.layer_height.value);
 
-    m_infill_extrusion_width = scaled<float>(region_config.infill_extrusion_width.percent ? default_infill_extrusion_width * 0.01 * region_config.infill_extrusion_width : region_config.infill_extrusion_width);
+    m_infill_extrusion_width = scaled<float>(region_config.infill_extrusion_width.percent ? default_infill_extrusion_width * 0.01 * region_config.infill_extrusion_width :
+                                             region_config.infill_extrusion_width != 0.   ? region_config.infill_extrusion_width :
+                                                                                            default_infill_extrusion_width);
     m_supporting_radius      = coord_t(m_infill_extrusion_width) * 100 / coord_t(region_config.fill_density.value);
 
     const double lightning_infill_overhang_angle      = M_PI / 4; // 45 degrees