diff --git a/src/libslic3r/Brim.cpp b/src/libslic3r/Brim.cpp
index 0fec89ced..f48d7ff0a 100644
--- a/src/libslic3r/Brim.cpp
+++ b/src/libslic3r/Brim.cpp
@@ -313,7 +313,7 @@ static std::vector<InnerBrimExPolygons> inner_brim_area(const Print
             // After 7ff76d07684858fd937ef2f5d863f105a10f798e offset and shrink don't work with CW polygons (holes), so let's make it CCW.
             Polygons ex_poly_holes_reversed = ex_poly.holes;
             polygons_reverse(ex_poly_holes_reversed);
-            for (const PrintInstance &instance : object->instances()) {
+            for ([[maybe_unused]] const PrintInstance &instance : object->instances()) {
                 ++polygon_idx; // Increase idx because of the contour of the ExPolygon.
 
                 if (brim_type == BrimType::btInnerOnly || brim_type == BrimType::btOuterAndInner)