diff --git a/go.sum b/go.sum
index d5d31f1f5..c256baa36 100644
--- a/go.sum
+++ b/go.sum
@@ -345,7 +345,6 @@ github.com/filecoin-project/go-state-types v0.0.0-20201102161440-c8033295a1fc/go
 github.com/filecoin-project/go-state-types v0.1.0/go.mod h1:ezYnPf0bNkTsDibL/psSz5dy4B5awOJ/E7P2Saeep8g=
 github.com/filecoin-project/go-state-types v0.1.6/go.mod h1:UwGVoMsULoCK+bWjEdd/xLCvLAQFBC7EDT477SKml+Q=
 github.com/filecoin-project/go-state-types v0.1.10/go.mod h1:UwGVoMsULoCK+bWjEdd/xLCvLAQFBC7EDT477SKml+Q=
-github.com/filecoin-project/go-state-types v0.11.0-rc1/go.mod h1:SyNPwTsU7I22gL2r0OAPcImvLoTVfgRwdK/Y5rR1zz8=
 github.com/filecoin-project/go-state-types v0.11.1 h1:GDtCN9V18bYVwXDZe+vJXc6Ck+qY9OUaQqpoVlp1FAk=
 github.com/filecoin-project/go-state-types v0.11.1/go.mod h1:SyNPwTsU7I22gL2r0OAPcImvLoTVfgRwdK/Y5rR1zz8=
 github.com/filecoin-project/go-statemachine v0.0.0-20200925024713-05bd7c71fbfe/go.mod h1:FGwQgZAt2Gh5mjlwJUlVB62JeYdo+if0xWxSEfBD9ig=
diff --git a/itests/wdpost_test.go b/itests/wdpost_test.go
index c94906b2f..34cc376eb 100644
--- a/itests/wdpost_test.go
+++ b/itests/wdpost_test.go
@@ -390,6 +390,9 @@ waitForProof:
 	inclTs, err := client.ChainGetTipSet(ctx, pmr.TipSet)
 	require.NoError(t, err)
 
+	inclTsParents, err := client.ChainGetTipSet(ctx, inclTs.Parents())
+	require.NoError(t, err)
+
 	nv, err := client.StateNetworkVersion(ctx, pmr.TipSet)
 	require.NoError(t, err)
 	require.Equal(t, network.Version19, nv)
@@ -410,8 +413,8 @@ waitForProof:
 
 	slmsg.Params = v1PostParams.Bytes()
 
-	// Simulate call on inclTs's parents, so that the partition isn't already proven
-	call, err := client.StateCall(ctx, slmsg, inclTs.Parents())
+	// Simulate call on inclTsParents's parents, so that the partition isn't already proven
+	call, err := client.StateCall(ctx, slmsg, inclTsParents.Parents())
 	require.NoError(t, err)
 	require.True(t, call.MsgRct.ExitCode.IsSuccess())
 }