diff --git a/app/controllers/timestamp_server_controller.rb b/app/controllers/timestamp_server_controller.rb
index 619a13b7..efab97c8 100644
--- a/app/controllers/timestamp_server_controller.rb
+++ b/app/controllers/timestamp_server_controller.rb
@@ -30,6 +30,7 @@ class TimestampServerController < ApplicationController
              reason: 'Test',
              certificate: pkcs.certificate,
              key: pkcs.key,
+             signature_size: 10_000,
              certificate_chain: pkcs.ca_certs || [],
              timestamp_handler: Submissions::TimestampHandler.new(tsa_url: url))
   end
diff --git a/lib/submissions/generate_audit_trail.rb b/lib/submissions/generate_audit_trail.rb
index ca54de58..db55f628 100644
--- a/lib/submissions/generate_audit_trail.rb
+++ b/lib/submissions/generate_audit_trail.rb
@@ -277,7 +277,10 @@ module Submissions
         certificate_chain: pkcs.ca_certs || []
       }
 
-      sign_params[:timestamp_handler] = Submissions::TimestampHandler.new(tsa_url:) if tsa_url
+      if tsa_url
+        sign_params[:timestamp_handler] = Submissions::TimestampHandler.new(tsa_url:)
+        sign_params[:signature_size] = 10_000
+      end
 
       composer.document.sign(io, **sign_params)
 
diff --git a/lib/submissions/generate_result_attachments.rb b/lib/submissions/generate_result_attachments.rb
index 62b9806a..6f00af5c 100644
--- a/lib/submissions/generate_result_attachments.rb
+++ b/lib/submissions/generate_result_attachments.rb
@@ -241,7 +241,10 @@ module Submissions
         certificate_chain: pkcs.ca_certs || []
       }
 
-      sign_params[:timestamp_handler] = Submissions::TimestampHandler.new(tsa_url:) if tsa_url
+      if tsa_url
+        sign_params[:timestamp_handler] = Submissions::TimestampHandler.new(tsa_url:)
+        sign_params[:signature_size] = 10_000
+      end
 
       pdf.sign(io, **sign_params)