diff --git a/zpay32/invoice.go b/zpay32/invoice.go
index 0856d3ea..4dbbfeec 100644
--- a/zpay32/invoice.go
+++ b/zpay32/invoice.go
@@ -265,9 +265,9 @@ func NewInvoice(net *chaincfg.Params, paymentHash [32]byte,
 	return invoice, nil
 }
 
-// Decode parses the provided encoded invoice, and returns a decoded Invoice in
-// case it is valid by BOLT-0011.
-func Decode(invoice string) (*Invoice, error) {
+// Decode parses the provided encoded invoice and returns a decoded Invoice if
+// it is valid by BOLT-0011 and matches the provided active network.
+func Decode(invoice string, net *chaincfg.Params) (*Invoice, error) {
 	decodedInvoice := Invoice{}
 
 	// Decode the invoice using the modified bech32 decoder.
@@ -276,9 +276,9 @@ func Decode(invoice string) (*Invoice, error) {
 		return nil, err
 	}
 
-	// We expect the human-readable part to at least have ln + two chars
+	// We expect the human-readable part to at least have ln + one char
 	// encoding the network.
-	if len(hrp) < 4 {
+	if len(hrp) < 3 {
 		return nil, fmt.Errorf("hrp too short")
 	}
 
@@ -288,24 +288,17 @@ func Decode(invoice string) (*Invoice, error) {
 	}
 
 	// The next characters should be a valid prefix for a segwit BIP173
-	// address. This will also determine which network this invoice is
-	// meant for.
-	var net *chaincfg.Params
-	if strings.HasPrefix(hrp[2:], chaincfg.MainNetParams.Bech32HRPSegwit) {
-		net = &chaincfg.MainNetParams
-	} else if strings.HasPrefix(hrp[2:], chaincfg.TestNet3Params.Bech32HRPSegwit) {
-		net = &chaincfg.TestNet3Params
-	} else if strings.HasPrefix(hrp[2:], chaincfg.SimNetParams.Bech32HRPSegwit) {
-		net = &chaincfg.SimNetParams
-	} else {
+	// address that match the active network.
+	if !strings.HasPrefix(hrp[2:], net.Bech32HRPSegwit) {
 		return nil, fmt.Errorf("unknown network")
 	}
 	decodedInvoice.Net = net
 
-	// Optionally, if there's anything left of the HRP, it encodes the
-	// payment amount.
-	if len(hrp) > 4 {
-		amount, err := decodeAmount(hrp[4:])
+	// Optionally, if there's anything left of the HRP after ln + the segwit
+	// prefix, we try to decode this as the payment amount.
+	var netPrefixLength = len(net.Bech32HRPSegwit) + 2
+	if len(hrp) > netPrefixLength {
+		amount, err := decodeAmount(hrp[netPrefixLength:])
 		if err != nil {
 			return nil, err
 		}
@@ -573,11 +566,7 @@ func parseData(invoice *Invoice, data []byte, net *chaincfg.Params) error {
 
 	// The rest are tagged parts.
 	tagData := data[7:]
-	if err := parseTaggedFields(invoice, tagData, net); err != nil {
-		return err
-	}
-
-	return nil
+	return parseTaggedFields(invoice, tagData, net)
 }
 
 // parseTimestamp converts a 35-bit timestamp (encoded in base32) to uint64.