diff --git a/files/gitlab-cookbooks/letsencrypt/resources/certificate.rb b/files/gitlab-cookbooks/letsencrypt/resources/certificate.rb
index f74d581596f2adeaa615ed4a3416ee906fdd0c92_ZmlsZXMvZ2l0bGFiLWNvb2tib29rcy9sZXRzZW5jcnlwdC9yZXNvdXJjZXMvY2VydGlmaWNhdGUucmI=..290ab7cfbe84a0ac179a78902906ace6760cb6f6_ZmlsZXMvZ2l0bGFiLWNvb2tib29rcy9sZXRzZW5jcnlwdC9yZXNvdXJjZXMvY2VydGlmaWNhdGUucmI= 100644
--- a/files/gitlab-cookbooks/letsencrypt/resources/certificate.rb
+++ b/files/gitlab-cookbooks/letsencrypt/resources/certificate.rb
@@ -63,8 +63,8 @@
 
   if new_resource.key_size.nil?
     unless production_key_size == node['acme']['key_size']
-      file "#{new_resource.key}" do
+      file new_resource.key.to_s do
         action :delete
       end
     end
   elsif production_key_size != new_resource.key_size
@@ -67,8 +67,8 @@
         action :delete
       end
     end
   elsif production_key_size != new_resource.key_size
-    file "#{new_resource.key}" do
+    file new_resource.key.to_s do
       action :delete
     end
   end