diff --git a/cid.go b/cid.go
index 2676f48..eb426ed 100644
--- a/cid.go
+++ b/cid.go
@@ -80,7 +80,7 @@ const (
 )
 
 // Codecs maps the name of a codec to its type
-var Codecs = map[string]byte{
+var Codecs = map[string]uint64{
 	"v0":                   DagProtobuf,
 	"raw":                  Raw,
 	"protobuf":             DagProtobuf,
diff --git a/cid_test.go b/cid_test.go
index b1095c4..11cdb63 100644
--- a/cid_test.go
+++ b/cid_test.go
@@ -15,7 +15,7 @@ import (
 // Copying the "silly test" idea from
 // https://github.com/multiformats/go-multihash/blob/7aa9f26a231c6f34f4e9fad52bf580fd36627285/multihash_test.go#L13
 // Makes it so changing the table accidentally has to happen twice.
-var tCodecs = map[byte]string{
+var tCodecs = map[uint64]string{
 	Raw:                "raw",
 	DagProtobuf:        "protobuf",
 	DagCBOR:            "cbor",