diff --git a/mock/submitproposal.go b/mock/submitproposal.go
index 96a78c6e..82858af4 100644
--- a/mock/submitproposal.go
+++ b/mock/submitproposal.go
@@ -20,6 +20,6 @@ import (
 )
 
 // SubmitProposal submits a proposal.
-func (*Service) SubmitProposal(_ context.Context, _ *api.VersionedSignedProposal) error {
+func (*Service) SubmitProposal(_ context.Context, _ *api.SubmitProposalOpts) error {
 	return nil
 }