diff --git a/lib/call_attempt.rb b/lib/call_attempt.rb
index 072a5c52eac84feaa15e6499d0b22ddab07ea32b..16546689a9221d71d591af767892e9db1475cd22 100644
--- a/lib/call_attempt.rb
+++ b/lib/call_attempt.rb
@@ -231,7 +231,7 @@ class CallAttempt
 		end
 	end
 
-	register do |**kwargs|
+	register do |customer:, **kwargs|
 		new(
 			**kwargs
 				.merge(customer_id: customer.customer_id)