diff --git a/blocks.go b/blocks.go
index ea4bf70..202e471 100644
--- a/blocks.go
+++ b/blocks.go
@@ -11,7 +11,7 @@ import (
 	u "gx/ipfs/QmZNVWh8LLjAavuQ2JXuFmuYH3C11xo988vSgp7UQrTRj1/go-ipfs-util"
 )
 
-var errWrongHash = errors.New("Data did not match given hash!")
+var ErrWrongHash = errors.New("Data did not match given hash!")
 
 type Block interface {
 	Multihash() mh.Multihash
@@ -39,7 +39,7 @@ func NewBlockWithHash(data []byte, h mh.Multihash) (*BasicBlock, error) {
 	if u.Debug {
 		chk := u.Hash(data)
 		if string(chk) != string(h) {
-			return nil, errWrongHash
+			return nil, ErrWrongHash
 		}
 	}
 	return &BasicBlock{data: data, multihash: h}, nil
diff --git a/blocks_test.go b/blocks_test.go
index 6c218be..1fecff8 100644
--- a/blocks_test.go
+++ b/blocks_test.go
@@ -89,7 +89,7 @@ func TestManualHash(t *testing.T) {
 	u.Debug = true
 
 	block, err = NewBlockWithHash(data, hash)
-	if err != errWrongHash {
+	if err != ErrWrongHash {
 		t.Fatal(err)
 	}