diff --git a/patacrep/latex/ast.py b/patacrep/latex/ast.py
index 798d4c33..f8112525 100644
--- a/patacrep/latex/ast.py
+++ b/patacrep/latex/ast.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 """Abstract Syntax Tree for LaTeX code."""
 
 # pylint: disable=too-few-public-methods
diff --git a/patacrep/latex/lexer.py b/patacrep/latex/lexer.py
index 8954e14c..c90303da 100644
--- a/patacrep/latex/lexer.py
+++ b/patacrep/latex/lexer.py
@@ -1,3 +1,4 @@
+# -*- coding: utf-8 -*-
 """Very simple LaTeX lexer."""
 
 import logging