diff --git a/build/params_butterfly.go b/build/params_butterfly.go
index 835c7dc7a..14b885e5f 100644
--- a/build/params_butterfly.go
+++ b/build/params_butterfly.go
@@ -47,6 +47,8 @@ func init() {
 	SetAddressNetwork(address.Testnet)
 
 	Devnet = true
+
+	BuildType = BuildButterflynet
 }
 
 const BlockDelaySecs = uint64(builtin2.EpochDurationSeconds)
diff --git a/build/params_nerpanet.go b/build/params_nerpanet.go
index 8879d01b5..8e18216db 100644
--- a/build/params_nerpanet.go
+++ b/build/params_nerpanet.go
@@ -67,6 +67,8 @@ func init() {
 	//miner.WPoStChallengeLookback = abi.ChainEpoch(2)
 
 	Devnet = false
+
+	BuildType = BuildNerpanet
 }
 
 const BlockDelaySecs = uint64(builtin2.EpochDurationSeconds)
diff --git a/build/version.go b/build/version.go
index 4e155c98a..eb98c4bfc 100644
--- a/build/version.go
+++ b/build/version.go
@@ -6,12 +6,14 @@ var CurrentCommit string
 var BuildType int
 
 const (
-	BuildDefault    = 0
-	BuildMainnet    = 0x1
-	Build2k         = 0x2
-	BuildDebug      = 0x3
-	BuildCalibnet   = 0x4
-	BuildInteropnet = 0x5
+	BuildDefault      = 0
+	BuildMainnet      = 0x1
+	Build2k           = 0x2
+	BuildDebug        = 0x3
+	BuildCalibnet     = 0x4
+	BuildInteropnet   = 0x5
+	BuildNerpanet     = 0x6
+	BuildButterflynet = 0x7
 )
 
 func buildType() string {
@@ -28,6 +30,10 @@ func buildType() string {
 		return "+calibnet"
 	case BuildInteropnet:
 		return "+interopnet"
+	case BuildNerpanet:
+		return "+nerpanet"
+	case BuildButterflynet:
+		return "+butterflynet"
 	default:
 		return "+huh?"
 	}