diff --git a/codec.go b/codec.go
index 2e8c9e5..feaecbf 100644
--- a/codec.go
+++ b/codec.go
@@ -171,29 +171,3 @@ func sizeForAddr(p Protocol, b []byte) (skip, size int, err error) {
 		return n, size, nil
 	}
 }
-
-func bytesSplit(b []byte) ([][]byte, error) {
-	var ret [][]byte
-	for len(b) > 0 {
-		code, n, err := multiaddr.ReadVarintCode(b)
-		if err != nil {
-			return nil, err
-		}
-
-		p := ProtocolWithCode(code)
-		if p.Code == 0 {
-			return nil, fmt.Errorf("no protocol with code %d", b[0])
-		}
-
-		n2, size, err := sizeForAddr(p, b[n:])
-		if err != nil {
-			return nil, err
-		}
-
-		length := n + n2 + size
-		ret = append(ret, b[:length])
-		b = b[length:]
-	}
-
-	return ret, nil
-}
diff --git a/multiprotocol_test.go b/multiprotocol_test.go
index 90b758a..9f9e06c 100644
--- a/multiprotocol_test.go
+++ b/multiprotocol_test.go
@@ -9,7 +9,7 @@ import (
 )
 
 func TestMain(m *testing.M) {
-	multiprotocol.Init("testdata/multiprotocol.csv")
+	_ = multiprotocol.Init("testdata/multiprotocol.csv")
 	os.Exit(m.Run())
 }