diff --git a/src/wireviz/Harness.py b/src/wireviz/Harness.py
index 9fc8bb1..b866390 100644
--- a/src/wireviz/Harness.py
+++ b/src/wireviz/Harness.py
@@ -321,8 +321,9 @@ class Harness:
             for row in listy[1:]:
                 file.write('<tr>')
                 for i, item in enumerate(row):
+                    item_str = item.replace('\u00b2', '&sup2;')
                     align = 'align="right"' if listy[0][i] == 'Qty' else ''
-                    file.write(f'<td {align} style="border:1px solid #000000; padding: 4px">{item}</td>')
+                    file.write(f'<td {align} style="border:1px solid #000000; padding: 4px">{item_str}</td>')
                 file.write('</tr>')
             file.write('</table>')