diff --git a/cmd/lotus-storage-miner/sectors.go b/cmd/lotus-storage-miner/sectors.go
index 09a963d06..563369c48 100644
--- a/cmd/lotus-storage-miner/sectors.go
+++ b/cmd/lotus-storage-miner/sectors.go
@@ -29,6 +29,7 @@ var sectorsCmd = &cli.Command{
 		sectorsPledgeCmd,
 		sectorsRemoveCmd,
 		sectorsMarkForUpgradeCmd,
+		sectorsStartSealCmd,
 	},
 }
 
@@ -268,6 +269,30 @@ var sectorsMarkForUpgradeCmd = &cli.Command{
 	},
 }
 
+var sectorsStartSealCmd = &cli.Command{
+	Name:      "seal",
+	Usage:     "Manually start sealing a sector (filling any unused space with junk)",
+	ArgsUsage: "<sectorNum>",
+	Action: func(cctx *cli.Context) error {
+		nodeApi, closer, err := lcli.GetStorageMinerAPI(cctx)
+		if err != nil {
+			return err
+		}
+		defer closer()
+		ctx := lcli.ReqContext(cctx)
+		if cctx.Args().Len() != 1 {
+			return xerrors.Errorf("must pass sector number")
+		}
+
+		id, err := strconv.ParseUint(cctx.Args().Get(0), 10, 64)
+		if err != nil {
+			return xerrors.Errorf("could not parse sector number: %w", err)
+		}
+
+		return nodeApi.SectorStartSealing(ctx, abi.SectorNumber(id))
+	},
+}
+
 var sectorsUpdateCmd = &cli.Command{
 	Name:  "update-state",
 	Usage: "ADVANCED: manually update the state of a sector, this may aid in error recovery",
diff --git a/go.sum b/go.sum
index bfde3d285..06920d6f2 100644
--- a/go.sum
+++ b/go.sum
@@ -237,8 +237,6 @@ github.com/filecoin-project/go-fil-commcid v0.0.0-20200208005934-2b8bd03caca5 h1
 github.com/filecoin-project/go-fil-commcid v0.0.0-20200208005934-2b8bd03caca5/go.mod h1:JbkIgFF/Z9BDlvrJO1FuKkaWsH673/UdFaiVS6uIHlA=
 github.com/filecoin-project/go-fil-markets v0.3.2 h1:fvNgdTTIVtckBu61wxbKYSMJzedoFFIKYJagiCDFCiM=
 github.com/filecoin-project/go-fil-markets v0.3.2/go.mod h1:e/IofcotbwH7ftgeK+TjjdjFsrCDWrh5vvnr7k1OSH8=
-github.com/filecoin-project/go-fil-markets v0.3.2-0.20200702145639-4034a18364e4 h1:VqNmKGy4/ryzo/TqevSa1kancc3hSdws7sl/NCTZzT0=
-github.com/filecoin-project/go-fil-markets v0.3.2-0.20200702145639-4034a18364e4/go.mod h1:UY+/zwNXHN73HcrN6HxNDpv6KKM6ehqfCuE9vK9khF8=
 github.com/filecoin-project/go-jsonrpc v0.1.1-0.20200602181149-522144ab4e24 h1:Jc7vkplmZYVuaEcSXGHDwefvZIdoyyaoGDLqSr8Svms=
 github.com/filecoin-project/go-jsonrpc v0.1.1-0.20200602181149-522144ab4e24/go.mod h1:j6zV//WXIIY5kky873Q3iIKt/ViOE8rcijovmpxrXzM=
 github.com/filecoin-project/go-padreader v0.0.0-20200210211231-548257017ca6 h1:92PET+sx1Hb4W/8CgFwGuxaKbttwY+UNspYZTvXY0vs=
@@ -266,8 +264,6 @@ github.com/filecoin-project/specs-actors v0.6.0/go.mod h1:dRdy3cURykh2R8O/DKqy8o
 github.com/filecoin-project/specs-actors v0.6.1/go.mod h1:dRdy3cURykh2R8O/DKqy8olScl70rmIS7GrB4hB1IDY=
 github.com/filecoin-project/specs-actors v0.7.1 h1:/zW++MN4gGIPvG+s0zmSI97k0Z/aaeiREjLC10gQbco=
 github.com/filecoin-project/specs-actors v0.7.1/go.mod h1:+z0htZu/wLBDbOLcQTKKUEC2rkUTFzL2KJ/bRAVWkws=
-github.com/filecoin-project/specs-actors v0.6.2-0.20200702170846-2cd72643a5cf h1:2ERozAZteHYef3tVLVJRepzYieLtJdxvfXNUel19CeU=
-github.com/filecoin-project/specs-actors v0.6.2-0.20200702170846-2cd72643a5cf/go.mod h1:dRdy3cURykh2R8O/DKqy8olScl70rmIS7GrB4hB1IDY=
 github.com/filecoin-project/specs-storage v0.1.0 h1:PkDgTOT5W5Ao7752onjDl4QSv+sgOVdJbvFjOnD5w94=
 github.com/filecoin-project/specs-storage v0.1.0/go.mod h1:Pr5ntAaxsh+sLG/LYiL4tKzvA83Vk5vLODYhfNwOg7k=
 github.com/filecoin-project/specs-storage v0.1.1-0.20200622113353-88a9704877ea h1:iixjULRQFPn7Q9KlIqfwLJnlAXO10bbkI+xy5GKGdLY=