diff --git a/app/utils.py b/app/utils.py
index 86bdb9f2b..f0c27d6b0 100644
--- a/app/utils.py
+++ b/app/utils.py
@@ -571,7 +571,7 @@ LETTER_VALIDATION_MESSAGES = {
         'title': 'Your letter is not A4 portrait size',
         'detail': (
             'You need to change the size or orientation of {invalid_pages}. <br>'
-            'Files must meet our <a href="{{ url_for('.upload_a_letter', _anchor='letter-specification') }}" target="_blank">letter specification</a>.'
+            'Files must meet our <a href="{letter_spec_guidance}" target="_blank">letter specification</a>.'
         ),
         'summary': (
             'Validation failed because {invalid_pages} {invalid_pages_are_or_is} not A4 portrait size.<br>'
@@ -582,7 +582,7 @@ LETTER_VALIDATION_MESSAGES = {
         'title': 'Your content is outside the printable area',
         'detail': (
             'You need to edit {invalid_pages}.<br>'
-            'Files must meet our <a href="{{ url_for('.upload_a_letter', _anchor='letter-specification') }}" target="_blank">letter specification</a>.'
+            'Files must meet our <a href="{letter_spec_guidance}" target="_blank">letter specification</a>.'
         ),
         'summary': (
             'Validation failed because content is outside the printable area on {invalid_pages}.<br>'
@@ -618,7 +618,7 @@ LETTER_VALIDATION_MESSAGES = {
         'title': 'The address block is empty',
         'detail': (
             'You need to add a recipient address.<br>'
-            'Files must meet our <a href="{{ url_for('.upload_a_letter', _anchor='letter-specification') }}" target="_blank">letter specification</a>.'
+            'Files must meet our <a href="{letter_spec_guidance}" target="_blank">letter specification</a>.'
         ),
         'summary': (
             'Validation failed because the address block is empty.<br>'