diff --git a/src/libslic3r/PrintObject.cpp b/src/libslic3r/PrintObject.cpp
index d7d4f0799..d29983175 100644
--- a/src/libslic3r/PrintObject.cpp
+++ b/src/libslic3r/PrintObject.cpp
@@ -2473,6 +2473,7 @@ ExPolygons PrintObject::_smooth_curves(const ExPolygons & input, const PrintRegi
         ExPolygons new_polys;
         for (const ExPolygon &ex_poly : input) {
             ExPolygon new_ex_poly(ex_poly);
+            new_ex_poly.contour.remove_collinear(SCALED_RESOLUTION);
             new_ex_poly.contour = _smooth_curve(new_ex_poly.contour, PI,
                 conf.curve_smoothing_angle_convex.value*PI / 180.0,
                 conf.curve_smoothing_angle_concave.value*PI / 180.0,
@@ -2480,13 +2481,14 @@ ExPolygons PrintObject::_smooth_curves(const ExPolygons & input, const PrintRegi
                 scale_(conf.curve_smoothing_precision.value));
             for (Polygon &phole : new_ex_poly.holes){
                 phole.reverse(); // make_counter_clockwise();
+                phole.remove_collinear(SCALED_RESOLUTION);
                 phole = _smooth_curve(phole, PI,
                     conf.curve_smoothing_angle_convex.value*PI / 180.0,
                     conf.curve_smoothing_angle_concave.value*PI / 180.0,
                     scale_(conf.curve_smoothing_cutoff_dist.value),
                     scale_(conf.curve_smoothing_precision.value));
                 phole.reverse(); // make_clockwise();
-            }
+                }
             new_polys.push_back(new_ex_poly);
         }
         return new_polys;