diff --git a/lib/Lacuna/DB/Result/Building/Archaeology.pm b/lib/Lacuna/DB/Result/Building/Archaeology.pm
index 1a1f3ca3..59227860 100644
--- a/lib/Lacuna/DB/Result/Building/Archaeology.pm
+++ b/lib/Lacuna/DB/Result/Building/Archaeology.pm
@@ -10,6 +10,7 @@ around 'build_tags' => sub {
     return ($orig->($class), qw(Infrastructure));
 };
 
+use constant max_instances_per_planet => 1;
 use constant controller_class => 'Lacuna::RPC::Building::Archaeology';
 
 use constant university_prereq => 10;