diff --git a/src/cata_tiles.cpp b/src/cata_tiles.cpp
index ba814ce3d2d00..58652cacfe20f 100644
--- a/src/cata_tiles.cpp
+++ b/src/cata_tiles.cpp
@@ -256,7 +256,11 @@ tileset::find_tile_type_by_season( const std::string &id, season_type season ) c
 
 tile_type &tileset::create_tile_type( const std::string &id, tile_type &&new_tile_type )
 {
-    auto inserted = tile_ids.insert( std::make_pair( id, new_tile_type ) ).first;
+    // Must overwrite existing tile
+    // TODO: c++17 - replace [] + find() with insert_or_assign()
+    tile_ids[id] = std::move( new_tile_type );
+    auto inserted = tile_ids.find( id );
+
     const std::string &inserted_id = inserted->first;
     tile_type &inserted_tile = inserted->second;
 
diff --git a/src/cata_tiles.h b/src/cata_tiles.h
index c736c3c76a5fa..df57d96250ffd 100644
--- a/src/cata_tiles.h
+++ b/src/cata_tiles.h
@@ -221,13 +221,7 @@ class tileset_loader
         void add_ascii_subtile( tile_type &curr_tile, const std::string &t_id, int sprite_id,
                                 const std::string &s_id );
         void load_ascii_set( const JsonObject &entry );
-        /**
-         * Create a new tile_type, add it to tile_ids (using <B>id</B>).
-         * Set the fg and bg properties of it (loaded from the json object).
-         * Makes sure each is either -1, or in the interval [0,size).
-         * If it's in that interval, adds offset to it, if it's not in the
-         * interval (and not -1), throw an std::string error.
-         */
+
         tile_type &load_tile( const JsonObject &entry, const std::string &id );
 
         void load_tile_spritelists( const JsonObject &entry, weighted_int_list<std::vector<int>> &vs,