diff --git a/system.cpp b/system.cpp
index 5436ae9d..77e412aa 100644
--- a/system.cpp
+++ b/system.cpp
@@ -1366,6 +1366,7 @@ EX void start_game() {
   ignored_memory_warning = false;
   check_cgi();
   cgi.require_basics();
+  arcm::current.compute_geometry();
   initcells();
   expansion.reset();