diff --git a/abi/cbor_gen.go b/abi/cbor_gen.go
index 55563644..97a5a4a5 100644
--- a/abi/cbor_gen.go
+++ b/abi/cbor_gen.go
@@ -251,3 +251,78 @@ func (t *AddrPairKey) UnmarshalCBOR(r io.Reader) (err error) {
 	}
 	return nil
 }
+
+func (t *DealIDList) MarshalCBOR(w io.Writer) error {
+	cw := cbg.NewCborWriter(w)
+
+	// (*t) (abi.DealIDList) (slice)
+	if len((*t)) > 8192 {
+		return xerrors.Errorf("Slice value in field (*t) was too long")
+	}
+
+	if err := cw.WriteMajorTypeHeader(cbg.MajArray, uint64(len((*t)))); err != nil {
+		return err
+	}
+	for _, v := range *t {
+
+		if err := cw.WriteMajorTypeHeader(cbg.MajUnsignedInt, uint64(v)); err != nil {
+			return err
+		}
+
+	}
+	return nil
+}
+
+func (t *DealIDList) UnmarshalCBOR(r io.Reader) (err error) {
+	*t = DealIDList{}
+
+	cr := cbg.NewCborReader(r)
+	var maj byte
+	var extra uint64
+	_ = maj
+	_ = extra
+	// (*t) (abi.DealIDList) (slice)
+
+	maj, extra, err = cr.ReadHeader()
+	if err != nil {
+		return err
+	}
+
+	if extra > 8192 {
+		return fmt.Errorf("(*t): array too large (%d)", extra)
+	}
+
+	if maj != cbg.MajArray {
+		return fmt.Errorf("expected cbor array")
+	}
+
+	if extra > 0 {
+		(*t) = make([]DealID, extra)
+	}
+
+	for i := 0; i < int(extra); i++ {
+		{
+			var maj byte
+			var extra uint64
+			var err error
+			_ = maj
+			_ = extra
+			_ = err
+
+			{
+
+				maj, extra, err = cr.ReadHeader()
+				if err != nil {
+					return err
+				}
+				if maj != cbg.MajUnsignedInt {
+					return fmt.Errorf("wrong type for uint64 field")
+				}
+				(*t)[i] = DealID(extra)
+
+			}
+
+		}
+	}
+	return nil
+}
diff --git a/abi/deal.go b/abi/deal.go
index 2208ab37..e1d7d62f 100644
--- a/abi/deal.go
+++ b/abi/deal.go
@@ -4,6 +4,8 @@ import "github.com/filecoin-project/go-state-types/big"
 
 type DealID uint64
 
+type DealIDList []DealID
+
 // BigInt types are aliases rather than new types because the latter introduce incredible amounts of noise
 // converting to and from types in order to manipulate values.
 // We give up some type safety for ergonomics.
diff --git a/gen/gen.go b/gen/gen.go
index ee7c740c..efac9b5f 100644
--- a/gen/gen.go
+++ b/gen/gen.go
@@ -13,6 +13,7 @@ func main() {
 		abi.PieceInfo{},
 		abi.SectorID{},
 		abi.AddrPairKey{},
+		abi.DealIDList{},
 	); err != nil {
 		panic(err)
 	}