diff --git a/src/escpos/escpos.py b/src/escpos/escpos.py
index d4c3a81..484ddc9 100644
--- a/src/escpos/escpos.py
+++ b/src/escpos/escpos.py
@@ -14,6 +14,7 @@ This module contains the abstract base class :py:class:`Escpos`.
 import textwrap
 from abc import ABCMeta, abstractmethod  # abstract base class support
 from re import match as re_match
+from typing import Union
 
 import barcode
 import qrcode
@@ -737,9 +738,9 @@ class Escpos(object):
         barcode_type,
         data,
         impl: str = "bitImageColumn",
-        module_height: (int | float) = 5,
-        module_width: (int | float) = 0.2,
-        text_distance: (int | float) = 5,
+        module_height: Union[int, float] = 5,
+        module_width: Union[int, float] = 0.2,
+        text_distance: Union[int, float] = 5,
         font_size: int = 10,
         center: bool = True,
     ):
@@ -783,13 +784,13 @@ class Escpos(object):
             * bitImageRaster
 
         :param module_height: barcode module height (in mm).
-        :type module_height: (int | float)
+        :type module_height: Union[int, float]
 
         :param module_width: barcode module width (in mm).
-        :type module_width: (int | float)
+        :type module_width: Union[int, float]
 
         :param text_distance: distance from the barcode to the code text (in mm).
-        :type text_distance: (int | float)
+        :type text_distance: Union[int, float]
 
         :param font_size: font size of the code text (in dots).
         :type font_size: int