3 files changed, 7 insertions, 6 deletions
diff --git a/fpga_interchange/site_arch.cc b/fpga_interchange/site_arch.cc
index cdb627ca..4438193b 100644
--- a/fpga_interchange/site_arch.cc
+++ b/fpga_interchange/site_arch.cc
@@ -269,6 +269,9 @@ SiteArch::SiteArch(const SiteInformation *site_info) : ctx(site_info->ctx), site
             NPNR_ASSERT(result.second);
         }
     }
+
+    blocking_net.name = ctx->id("$nextpnr_blocked_net");
+    blocking_site_net.net = &blocking_net;
 }
 
 const char *SiteArch::nameOfWire(const SiteWire &wire) const
diff --git a/fpga_interchange/site_arch.h b/fpga_interchange/site_arch.h
index 91330aa0..a7da5c68 100644
--- a/fpga_interchange/site_arch.h
+++ b/fpga_interchange/site_arch.h
@@ -279,6 +279,9 @@ struct SiteArch
     HashTables::HashMap<NetInfo *, SiteNetInfo> nets;
     HashTables::HashMap<SiteWire, SiteNetMap> wire_to_nets;
 
+    NetInfo blocking_net;
+    SiteNetInfo blocking_site_net;
+
     std::vector<PipId> input_site_ports;
     std::vector<PipId> output_site_ports;
 
diff --git a/fpga_interchange/site_router.cc b/fpga_interchange/site_router.cc
index aa82eca9..03d93ce3 100644
--- a/fpga_interchange/site_router.cc
+++ b/fpga_interchange/site_router.cc
@@ -1033,11 +1033,6 @@ static void block_lut_outputs(SiteArch *site_arch,
         const HashTables::HashSet<std::pair<IdString, IdString>> &blocked_wires) {
     const Context * ctx = site_arch->site_info->ctx;
     auto &tile_info = ctx->chip_info->tile_types[site_arch->site_info->tile_type];
-    NetInfo blocking_net;
-    blocking_net.name = ctx->id("$nextpnr_blocked_net");
-
-    SiteNetInfo blocking_site_net;
-    blocking_site_net.net = &blocking_net;
     for(const auto & bel_pin_pair : blocked_wires) {
         IdString bel_name = bel_pin_pair.first;
         IdString bel_pin = bel_pin_pair.second;
@@ -1056,7 +1051,7 @@ static void block_lut_outputs(SiteArch *site_arch,
         bel.index = bel_index;
 
         SiteWire lut_output_wire = site_arch->getBelPinWire(bel, bel_pin);
-        site_arch->bindWire(lut_output_wire, &blocking_site_net);
+        site_arch->bindWire(lut_output_wire, &site_arch->blocking_site_net);
     }
 }