diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3752670f6..85870585c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 - Fix a bug: unable to configure RAILS_LOCALE to fr-CA
 - Fix a bug: unable to fix availabilities for events
+- Fix a bug: unable to start Fab-manager with message: maximum must be a nonnegative Integer
 
 ## v5.7.0 2023 February 17
 
diff --git a/app/models/supporting_document_file.rb b/app/models/supporting_document_file.rb
index 36e848064..77b2132eb 100644
--- a/app/models/supporting_document_file.rb
+++ b/app/models/supporting_document_file.rb
@@ -8,5 +8,5 @@ class SupportingDocumentFile < ApplicationRecord
   belongs_to :supporting_document_type
   belongs_to :user
 
-  validates :attachment, file_size: { maximum: ENV.fetch('MAX_SUPPORTING_DOCUMENT_FILE_SIZE', 5.megabytes.to_i) }
+  validates :attachment, file_size: { maximum: ENV.fetch('MAX_SUPPORTING_DOCUMENT_FILE_SIZE', 5.megabytes).to_i }
 end