diff --git a/src/mapgen.cpp b/src/mapgen.cpp
index 77d2820fce95b..405303a1a33bc 100644
--- a/src/mapgen.cpp
+++ b/src/mapgen.cpp
@@ -5643,14 +5643,8 @@ void map::place_spawns( const mongroup_id &group, const int chance,
         // Pick a monster type
         MonsterGroupResult spawn_details = MonsterGroupManager::GetResultFromGroup( group, &num );
 
-        const MonsterGroup &mg = group.obj();
-        auto mon_selected = std::find_if( mg.monsters.begin(), mg.monsters.end(),
-        [spawn_details]( const MonsterGroupEntry & mon ) {
-            return mon.name == spawn_details.name;
-        } );
-
         add_spawn( spawn_details.name, spawn_details.pack_size, { x, y, abs_sub.z },
-                   friendly, -1, mission_id, name, mon_selected->data );
+                   friendly, -1, mission_id, name, spawn_details.data );
     }
 }
 
diff --git a/src/mongroup.cpp b/src/mongroup.cpp
index 989810fd5200e..21b22101cdea0 100644
--- a/src/mongroup.cpp
+++ b/src/mongroup.cpp
@@ -101,7 +101,7 @@ MonsterGroupResult MonsterGroupManager::GetResultFromGroup(
     auto &group = GetUpgradedMonsterGroup( group_name );
     int spawn_chance = rng( 1, group.freq_total ); //Default 1000 unless specified
     //Our spawn details specify, by default, a single instance of the default monster
-    MonsterGroupResult spawn_details = MonsterGroupResult( group.defaultMonster, 1 );
+    MonsterGroupResult spawn_details = MonsterGroupResult( group.defaultMonster, 1, spawn_data() );
 
     bool monster_found = false;
     // Loop invariant values
@@ -174,9 +174,9 @@ MonsterGroupResult MonsterGroupManager::GetResultFromGroup(
             //If the monsters frequency is greater than the spawn_chance, select this spawn rule
             if( it->frequency >= spawn_chance ) {
                 if( it->pack_maximum > 1 ) {
-                    spawn_details = MonsterGroupResult( it->name, rng( it->pack_minimum, it->pack_maximum ) );
+                    spawn_details = MonsterGroupResult( it->name, rng( it->pack_minimum, it->pack_maximum ), it->data );
                 } else {
-                    spawn_details = MonsterGroupResult( it->name, 1 );
+                    spawn_details = MonsterGroupResult( it->name, 1, it->data );
                 }
                 //And if a quantity pointer with remaining value was passed, will modify the external value as a side effect
                 //We will reduce it by the spawn rule's cost multiplier
diff --git a/src/mongroup.h b/src/mongroup.h
index 40a81ecd65a6c..a19e581e79187 100644
--- a/src/mongroup.h
+++ b/src/mongroup.h
@@ -55,12 +55,13 @@ struct MonsterGroupEntry {
 struct MonsterGroupResult {
     mtype_id name;
     int pack_size;
+    spawn_data data;
 
     MonsterGroupResult() : name( mtype_id::NULL_ID() ), pack_size( 0 ) {
     }
 
-    MonsterGroupResult( const mtype_id &id, int new_pack_size )
-        : name( id ), pack_size( new_pack_size ) {
+    MonsterGroupResult( const mtype_id &id, int new_pack_size, spawn_data new_data )
+        : name( id ), pack_size( new_pack_size ), data( new_data ) {
     }
 };