diff --git a/checks.go b/checks.go
index 0b9f14b84..b599eb8cf 100644
--- a/checks.go
+++ b/checks.go
@@ -1,6 +1,7 @@
 package sealing
 
 import (
+	"bytes"
 	"context"
 
 	"golang.org/x/xerrors"
@@ -98,7 +99,12 @@ func (m *Sealing) checkCommit(ctx context.Context, si SectorInfo, proof []byte,
 		return &ErrBadSeed{xerrors.Errorf("seed epoch doesn't match on chain info: %d != %d", pci.PreCommitEpoch+miner.PreCommitChallengeDelay, si.SeedEpoch)}
 	}
 
-	seed, err := m.api.ChainGetRandomness(ctx, tok, crypto.DomainSeparationTag_InteractiveSealChallengeSeed, si.SeedEpoch, nil)
+	buf := new(bytes.Buffer)
+	if err := m.maddr.MarshalCBOR(buf); err != nil {
+		return err
+	}
+
+	seed, err := m.api.ChainGetRandomness(ctx, tok, crypto.DomainSeparationTag_InteractiveSealChallengeSeed, si.SeedEpoch, buf.Bytes())
 	if err != nil {
 		return &ErrApi{xerrors.Errorf("failed to get randomness for computing seal proof: %w", err)}
 	}
diff --git a/states.go b/states.go
index 223b0065f..d99fd859e 100644
--- a/states.go
+++ b/states.go
@@ -176,7 +176,12 @@ func (m *Sealing) handleWaitSeed(ctx statemachine.Context, sector SectorInfo) er
 	randHeight := pci.PreCommitEpoch + miner.PreCommitChallengeDelay
 
 	err = m.events.ChainAt(func(ectx context.Context, tok TipSetToken, curH abi.ChainEpoch) error {
-		rand, err := m.api.ChainGetRandomness(ectx, tok, crypto.DomainSeparationTag_InteractiveSealChallengeSeed, randHeight, nil)
+		buf := new(bytes.Buffer)
+		if err := m.maddr.MarshalCBOR(buf); err != nil {
+			return err
+		}
+
+		rand, err := m.api.ChainGetRandomness(ectx, tok, crypto.DomainSeparationTag_InteractiveSealChallengeSeed, randHeight, buf.Bytes())
 		if err != nil {
 			err = xerrors.Errorf("failed to get randomness for computing seal proof: %w", err)