diff --git a/src/init.cpp b/src/init.cpp
index ce666534ae..89418bc1f7 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -1301,6 +1301,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
         }
         for (int n = 0; n < NET_MAX; n++) {
             enum Network net = (enum Network)n;
+            assert(IsReachable(net));
             if (!nets.count(net))
                 SetReachable(net, false);
         }