diff --git a/latex/thesis.cls b/latex/thesis.cls
index 29a6b29..e1723e5 100644
--- a/latex/thesis.cls
+++ b/latex/thesis.cls
@@ -9,6 +9,7 @@
 \LoadClass[a4paper,12pt,oneside]{book}
 
 % Load common packages
+\RequirePackage{polyglossia}
 \RequirePackage{fontspec}
 \RequirePackage{titlesec}
 \RequirePackage{fancyhdr}
@@ -20,6 +21,10 @@
 \RequirePackage{tocloft}
 \RequirePackage{tocbibind}
 
+% Polyglossia set language
+\setmainlanguage{bahasai}
+% \setotherlanguage{english}
+
 % Conditionally load the watermark package and settings
 \if@draftmark
   \RequirePackage{draftwatermark}