diff --git a/legacy.cpp b/legacy.cpp
index 3dcbf93d..d872ff3e 100644
--- a/legacy.cpp
+++ b/legacy.cpp
@@ -204,7 +204,7 @@ int modecodetable[42][6] = {
 
 EX modecode_t legacy_modecode() {
   if(int(geometry) > 3 || int(variation) > 1) return UNKNOWN;
-  if(!ls::nice_walls() && !ls::std_chaos()) return UNKNOWN;
+  if(!ls::nice_walls() && !ls::std_chaos() && !yendor::on && !tactic::on) return UNKNOWN;
   // compute the old code
   int xcode = 0;
 
diff --git a/yendor.cpp b/yendor.cpp
index 029206d0..93b92528 100644
--- a/yendor.cpp
+++ b/yendor.cpp
@@ -1069,7 +1069,7 @@ char xcheat;
 void save_mode_data(hstream& f) {
   mapstream::save_geometry(f);
   
-  if(yendor::on) 
+  if(yendor::on || tactic::on) 
     f.write<char>(0);
   else
     f.write<char>(land_structure);