diff --git a/vpr/src/route/rr_graph.cpp b/vpr/src/route/rr_graph.cpp
index af3dbc472a3..ee25b1d3531 100644
--- a/vpr/src/route/rr_graph.cpp
+++ b/vpr/src/route/rr_graph.cpp
@@ -1139,7 +1139,7 @@ static void build_rr_graph(const t_graph_type graph_type,
                         "seg = %d (%s), Fc_out = %d, Fc_in = %d.\n",
                         type.name,
                         j,
-                        block_type_pin_index_to_name(&type, j).c_str(),
+                        block_type_pin_index_to_name(&type, j, is_flat).c_str(),
                         k,
                         segment_inf[k].name.c_str(),
                         Fc_out[i][j][k],