diff --git a/src/libslic3r/LayerRegion.cpp b/src/libslic3r/LayerRegion.cpp
index cdd6837aa..71d84e17a 100644
--- a/src/libslic3r/LayerRegion.cpp
+++ b/src/libslic3r/LayerRegion.cpp
@@ -204,7 +204,11 @@ void LayerRegion::process_external_surfaces(const Layer* lower_layer)
                         break;
                     }
                 // Grown by bridged_infill_margin.
-                Polygons polys = offset(to_polygons(bridges[i].expolygon), float(margin_bridged), EXTERNAL_SURFACES_OFFSET_PARAMETERS);
+                // also, remove all bridge area that are thinner than a single line.
+                Polygons polys = offset2(to_polygons(bridges[i].expolygon),
+                    (-this->flow(frInfill).scaled_width() / 2), 
+                    (this->flow(frInfill).scaled_width() / 2) + float(margin_bridged), 
+                    EXTERNAL_SURFACES_OFFSET_PARAMETERS);
                 if (idx_island == -1) {
                     printf("Bridge did not fall into the source region!\r\n");
                 } else {
diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 58e6af401..d4e74a55e 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -501,7 +501,7 @@ void PrintConfigDef::init_fff_params()
     def->category = L("Infill");
     def->tooltip = L("This parameter grows the bridged solid infill layers by the specified MM to anchor them into the part. Put 0 to deactivate it.");
     def->sidetext = L("mm");
-    def->cli = "top-layer-anchor=f";
+    def->cli = "bridged-layer-anchor=f";
     def->min = 0;
     def->mode = comExpert;
     def->default_value = new ConfigOptionFloat(2);
diff --git a/src/libslic3r/PrintObject.cpp b/src/libslic3r/PrintObject.cpp
index a2ba03820..a531729e4 100644
--- a/src/libslic3r/PrintObject.cpp
+++ b/src/libslic3r/PrintObject.cpp
@@ -486,8 +486,6 @@ bool PrintObject::invalidate_state_by_config_options(const std::vector<t_config_
             || opt_key == "support_material_contact_distance_top" 
             || opt_key == "support_material_contact_distance_bottom" 
             || opt_key == "xy_size_compensation"
-            || opt_key == "external_infill_margin"
-            || opt_key == "bridged_infill_margin"
             || opt_key == "hole_size_compensation") {
             steps.emplace_back(posSlice);
         } else if (
@@ -527,6 +525,8 @@ bool PrintObject::invalidate_state_by_config_options(const std::vector<t_config_
             || opt_key == "solid_infill_extruder"
             || opt_key == "infill_extrusion_width"
             || opt_key == "ensure_vertical_shell_thickness"
+            || opt_key == "external_infill_margin"
+            || opt_key == "bridged_infill_margin"
             || opt_key == "bridge_angle") {
             steps.emplace_back(posPrepareInfill);
         } else if (