diff --git a/src/libslic3r/PerimeterGenerator.cpp b/src/libslic3r/PerimeterGenerator.cpp
index 9037118f0c..a6b38889a5 100644
--- a/src/libslic3r/PerimeterGenerator.cpp
+++ b/src/libslic3r/PerimeterGenerator.cpp
@@ -2127,7 +2127,7 @@ void PerimeterGenerator::process_no_bridge(Surfaces& all_surfaces, coord_t perim
                                 bridgeable_filtered = union_ex(offset_ex(remaining, perimeter_spacing), bridgeable_filtered);
                                 bridgeable_filtered = offset_ex(bridgeable_filtered, -perimeter_spacing);
                                 bridgeable_filtered = diff_ex(bridgeable_filtered, remaining, ApplySafetyOffset::Yes);
-                                bridgeable_filtered = opening_ex(bridgeable_filtered, perimeter_spacing); // filter noise from the diff_ex
+                                bridgeable_filtered = opening_ex(bridgeable_filtered, ext_perimeter_width / 2); // filter noise from the diff_ex
                                 bridgeable_filtered = offset_ex(bridgeable_filtered, perimeter_spacing);  // restore the size to the original bridgeable area
                                 // Safety measure: Keep the bridge mask from intruding deeper into the
                                 // supported anchor region than the explicit anchor overlap.