diff --git a/vpr/src/tileable_rr_graph/tileable_rr_graph_edge_builder.cpp b/vpr/src/tileable_rr_graph/tileable_rr_graph_edge_builder.cpp
index e974db8c8b3..471f68ad49c 100644
--- a/vpr/src/tileable_rr_graph/tileable_rr_graph_edge_builder.cpp
+++ b/vpr/src/tileable_rr_graph/tileable_rr_graph_edge_builder.cpp
@@ -139,7 +139,7 @@ void build_rr_graph_edges(const RRGraphView& rr_graph,
             /* Create a GSB object */
             const RRGSB& rr_gsb = build_one_tileable_rr_gsb(grids, rr_graph,
                                                             device_chan_width, segment_inf_x, segment_inf_y,
-                                                            layer, gsb_coord);
+                                                            layer, gsb_coord, perimeter_cb);
 
             /* adapt the track_to_ipin_lookup for the GSB nodes */
             t_track2pin_map track2ipin_map; /* [0..track_gsb_side][0..num_tracks][ipin_indices] */
diff --git a/vpr/src/tileable_rr_graph/tileable_rr_graph_gsb.cpp b/vpr/src/tileable_rr_graph/tileable_rr_graph_gsb.cpp
index 79f4166e190..01682243754 100644
--- a/vpr/src/tileable_rr_graph/tileable_rr_graph_gsb.cpp
+++ b/vpr/src/tileable_rr_graph/tileable_rr_graph_gsb.cpp
@@ -623,7 +623,8 @@ RRGSB build_one_tileable_rr_gsb(const DeviceGrid& grids,
                                 const std::vector<t_segment_inf>& segment_inf_x,
                                 const std::vector<t_segment_inf>& segment_inf_y,
                                 const size_t& layer,
-                                const vtr::Point<size_t>& gsb_coordinate) {
+                                const vtr::Point<size_t>& gsb_coordinate,
+                                const bool& perimeter_cb) {
     /* Create an object to return */
     RRGSB rr_gsb;
 
@@ -719,7 +720,7 @@ RRGSB build_one_tileable_rr_gsb(const DeviceGrid& grids,
                 break;
             case BOTTOM: /* BOTTOM = 2*/
                 /* For the bording, we should take special care */
-                if (gsb_coordinate.y() == 0) {
+                if (!perimeter_cb && gsb_coordinate.y() == 0) {
                     rr_gsb.clear_one_side(side_manager.get_side());
                     break;
                 }
@@ -749,7 +750,7 @@ RRGSB build_one_tileable_rr_gsb(const DeviceGrid& grids,
                 break;
             case LEFT: /* LEFT = 3 */
                 /* For the bording, we should take special care */
-                if (gsb_coordinate.x() == 0) {
+                if (!perimeter_cb && gsb_coordinate.x() == 0) {
                     rr_gsb.clear_one_side(side_manager.get_side());
                     break;
                 }
diff --git a/vpr/src/tileable_rr_graph/tileable_rr_graph_gsb.h b/vpr/src/tileable_rr_graph/tileable_rr_graph_gsb.h
index 4d3bbfdcc67..ca17517a8d9 100644
--- a/vpr/src/tileable_rr_graph/tileable_rr_graph_gsb.h
+++ b/vpr/src/tileable_rr_graph/tileable_rr_graph_gsb.h
@@ -47,7 +47,8 @@ RRGSB build_one_tileable_rr_gsb(const DeviceGrid& grids,
                                 const std::vector<t_segment_inf>& segment_inf_x,
                                 const std::vector<t_segment_inf>& segment_inf_y,
                                 const size_t& layer,
-                                const vtr::Point<size_t>& gsb_coordinate);
+                                const vtr::Point<size_t>& gsb_coordinate,
+                                const bool& perimeter_cb);
 
 void build_edges_for_one_tileable_rr_gsb(RRGraphBuilder& rr_graph_builder,
                                          const RRGSB& rr_gsb,