diff --git a/pdf/utils.py b/pdf/utils.py
index 6416f90..3af0225 100644
--- a/pdf/utils.py
+++ b/pdf/utils.py
@@ -38,11 +38,11 @@ def md_to_latex(text: str) -> str:
 
 
 env = jinja2.Environment(
-    block_start_string='\BLOCK{',
+    block_start_string=r'\BLOCK{',
     block_end_string='}',
-    variable_start_string='\VAR{',
+    variable_start_string=r'\VAR{',
     variable_end_string='}',
-    comment_start_string='\#{',
+    comment_start_string=r'\#{',
     comment_end_string='}',
     line_statement_prefix='%#',
     line_comment_prefix='%%',