diff --git a/lib/Slic3r/Geometry/Clipper.pm b/lib/Slic3r/Geometry/Clipper.pm
index 0c2cbfe35..b1981a3be 100644
--- a/lib/Slic3r/Geometry/Clipper.pm
+++ b/lib/Slic3r/Geometry/Clipper.pm
@@ -113,7 +113,7 @@ sub ex_int_offset2 {
 }
 
 sub collapse_ex {
-    my ($polygons, $width) = @_;use XXX; YYY 
+    my ($polygons, $width) = @_;
     return [ ex_int_offset2($polygons, -$width/2, +$width/2) ];
 }