diff --git a/libpov.js b/libpov.js
index f1e9d0f..07ec541 100644
--- a/libpov.js
+++ b/libpov.js
@@ -2189,7 +2189,7 @@ inputExportLua.onclick = function() {
 		// escape quotation mark
 		escapedName = escapedName.replace(/"/g, '\\\"');
 
-		str += "minetest.register_biome({\n";
+		str += "core.register_biome({\n";
 		str += `    name = \"${escapedName}\",\n`;
 		str += `    heat_point = ${biome.heat},\n`;
 		str += `    humidity_point = ${biome.humidity},\n`;