diff --git a/node/impl/full/chain.go b/node/impl/full/chain.go
index 15eb6e5a685..ca245dcdad3 100644
--- a/node/impl/full/chain.go
+++ b/node/impl/full/chain.go
@@ -654,9 +654,9 @@ func (a *ChainAPI) ChainBlockstoreInfo(ctx context.Context) (map[string]interfac
 	return info.Info(), nil
 }
 
-func (a *ChainAPI) ChainPrune(ctx context.Context, opts map[string]interface{}) error {
+func (a *ChainAPI) ChainPrune(ctx context.Context, opts api.PruneOpts) error {
 	pruner, ok := a.BaseBlockstore.(interface {
-		PruneChain(opts map[string]interface{}) error
+		PruneChain(opts api.PruneOpts) error
 	})
 	if !ok {
 		return xerrors.Errorf("base blockstore does not support pruning (%T)", a.BaseBlockstore)