diff --git a/xs/src/libslic3r/SLAPrint.cpp b/xs/src/libslic3r/SLAPrint.cpp
index 7acddb9ff5..826e6184ec 100644
--- a/xs/src/libslic3r/SLAPrint.cpp
+++ b/xs/src/libslic3r/SLAPrint.cpp
@@ -189,7 +189,7 @@ SLAPrint::_infill_layer(size_t i, const Fill* _fill)
         fill->z        = layer.print_z;
         
         ExtrusionPath templ(erInternalInfill);
-        templ.width = fill->spacing;
+        templ.width = fill->spacing();
         const ExPolygons internal_ex = intersection_ex(infill, internal);
         for (ExPolygons::const_iterator it = internal_ex.begin(); it != internal_ex.end(); ++it) {
             Polylines polylines = fill->fill_surface(Surface(stInternal, *it));