diff --git a/lib/pacto/core/contract_registry.rb b/lib/pacto/core/contract_registry.rb
index <HASH>..<HASH> 100644
--- a/lib/pacto/core/contract_registry.rb
+++ b/lib/pacto/core/contract_registry.rb
@@ -1,6 +1,6 @@
 module Pacto
   class ContractRegistry
-    def register_contract(contract = nil, *tags)
+    def register_contract(contract, *tags)
       tags << :default if tags.empty?
 
       tags.uniq.each do |tag|
Remove default value for register_contract

There is no need to register a nil contract