diff --git a/lib/Slic3r/Layer/Region.pm b/lib/Slic3r/Layer/Region.pm
index 357f63645..6af5c3d97 100644
--- a/lib/Slic3r/Layer/Region.pm
+++ b/lib/Slic3r/Layer/Region.pm
@@ -284,7 +284,7 @@ sub make_perimeters {
             
             # detect overhanging/bridging perimeters
             my @paths = ();
-            if ($self->region->config->overhangs && $lower_slices->count > 0) {
+            if ($self->region->config->overhangs) {
                 # get non-overhang paths by intersecting this loop with the grown lower slices
                 foreach my $polyline (@{ intersection_ppl([ $polygon ], $lower_slices_p) }) {
                     push @paths, Slic3r::ExtrusionPath->new(
diff --git a/lib/Slic3r/Print/Object.pm b/lib/Slic3r/Print/Object.pm
index d7878e25a..af07f3488 100644
--- a/lib/Slic3r/Print/Object.pm
+++ b/lib/Slic3r/Print/Object.pm
@@ -700,7 +700,14 @@ sub detect_surfaces_type {
                 # if no lower layer, all surfaces of this one are solid
                 # we clone surfaces because we're going to clear the slices collection
                 @bottom = map $_->clone, @{$layerm->slices};
-                $_->surface_type(S_TYPE_BOTTOM) for @bottom;
+                
+                # if we have raft layers, consider bottom layer as a bridge
+                # just like any other bottom surface lying on the void
+                if ($self->config->raft_layers > 0) {
+                    $_->surface_type(S_TYPE_BOTTOMBRIDGE) for @bottom;
+                } else {
+                    $_->surface_type(S_TYPE_BOTTOM) for @bottom;
+                }
             }
             
             # now, if the object contained a thin membrane, we could have overlapping bottom