diff --git a/plugins/languages/treesitter/treesitter.nix b/plugins/languages/treesitter/treesitter.nix
index cca49924..4c8a56e0 100644
--- a/plugins/languages/treesitter/treesitter.nix
+++ b/plugins/languages/treesitter/treesitter.nix
@@ -165,7 +165,7 @@ in {
         + ''
           require('nvim-treesitter.configs').setup(${helpers.toLuaObject tsOptions})
         ''
-        + (optionalString (cfg.languageRegister != null) ''
+        + (optionalString (cfg.languageRegister != {}) ''
           __parserFiltypeMappings = ${helpers.toLuaObject cfg.languageRegister}
 
           for parser_name, ft in pairs(__parserFiltypeMappings) do