diff --git a/app/models/seed_generator.rb b/app/models/seed_generator.rb
index 6717eabd..482a65a1 100755
--- a/app/models/seed_generator.rb
+++ b/app/models/seed_generator.rb
@@ -17,7 +17,7 @@ class SeedGenerator < ApplicationRecord
     end
 
     seed = self.update_seed(model_name)
-    length = 15 - prefix.length
+    length = 16 - prefix.length
     prefix + seed.to_s.rjust(length, '0')
   end
 
@@ -39,7 +39,7 @@ class SeedGenerator < ApplicationRecord
 
     start = self.update_seed(model_name, count)
     stop = start + count - 1
-    length = 15 - prefix.length
+    length = 16 - prefix.length
     (start..stop).map { |c| prefix + c.to_s.rjust(length, '0') }
   end