diff --git a/app/template/rest.py b/app/template/rest.py
index 22f3295c9..c938b2ea6 100644
--- a/app/template/rest.py
+++ b/app/template/rest.py
@@ -266,7 +266,7 @@ def _get_png_preview(url, data, notification_id):
                 resp.content
             ))
         raise InvalidRequest(
-            'Error generating preview letter for {} \nStatus code: {}\n{}'.format(
+            'Error generating preview letter for {}\nStatus code: {}\n{}'.format(
                 notification_id,
                 resp.status_code,
                 resp.content
diff --git a/tests/app/template/test_rest.py b/tests/app/template/test_rest.py
index 14e0aba55..99889e238 100644
--- a/tests/app/template/test_rest.py
+++ b/tests/app/template/test_rest.py
@@ -874,7 +874,9 @@ def test_preview_letter_template_by_id_template_preview_500(
                 _expected_status=500
             )
 
-            assert resp['message'] == 'Error generating preview for {}'.format(sample_letter_notification.id)
+            assert 'Status code: 404' in resp['message']
+            assert 'Error generating preview letter for {}'.format(sample_letter_notification.id) in resp['message']
+
 
 
 def test_preview_letter_template_precompiled_pdf_file_type(