diff --git a/core/coreiface/tests/block.go b/core/coreiface/tests/block.go
index 7dbfa4df040..8d0243e7ee1 100644
--- a/core/coreiface/tests/block.go
+++ b/core/coreiface/tests/block.go
@@ -8,6 +8,7 @@ import (
 	"strings"
 	"testing"
 
+	ipld "github.com/ipfs/go-ipld-format"
 	coreiface "github.com/ipfs/interface-go-ipfs-core"
 	opt "github.com/ipfs/interface-go-ipfs-core/options"
 	"github.com/ipfs/interface-go-ipfs-core/path"
@@ -179,7 +180,7 @@ func (tp *TestSuite) TestBlockRm(t *testing.T) {
 	if err == nil {
 		t.Fatal("expected err to exist")
 	}
-	if !strings.Contains(err.Error(), "blockservice: key not found") {
+	if !ipld.IsNotFound(err) {
 		t.Errorf("unexpected error; %s", err.Error())
 	}
 
@@ -187,7 +188,7 @@ func (tp *TestSuite) TestBlockRm(t *testing.T) {
 	if err == nil {
 		t.Fatal("expected err to exist")
 	}
-	if !strings.Contains(err.Error(), "blockstore: block not found") {
+	if !strings.Contains(err.Error(), "not found") {
 		t.Errorf("unexpected error; %s", err.Error())
 	}
 
diff --git a/core/coreiface/tests/unixfs.go b/core/coreiface/tests/unixfs.go
index 4273386aaaa..f47d34d0a50 100644
--- a/core/coreiface/tests/unixfs.go
+++ b/core/coreiface/tests/unixfs.go
@@ -5,7 +5,6 @@ import (
 	"context"
 	"encoding/hex"
 	"fmt"
-	"github.com/ipfs/interface-go-ipfs-core/path"
 	"io"
 	"io/ioutil"
 	"math"
@@ -16,12 +15,15 @@ import (
 	"sync"
 	"testing"
 
+	"github.com/ipfs/interface-go-ipfs-core/path"
+
 	coreiface "github.com/ipfs/interface-go-ipfs-core"
 	"github.com/ipfs/interface-go-ipfs-core/options"
 
 	"github.com/ipfs/go-cid"
-	"github.com/ipfs/go-ipfs-files"
+	files "github.com/ipfs/go-ipfs-files"
 	cbor "github.com/ipfs/go-ipld-cbor"
+	ipld "github.com/ipfs/go-ipld-format"
 	mdag "github.com/ipfs/go-merkledag"
 	"github.com/ipfs/go-unixfs"
 	"github.com/ipfs/go-unixfs/importer/helpers"
@@ -576,7 +578,7 @@ func (tp *TestSuite) TestAddHashOnly(t *testing.T) {
 	if err == nil {
 		t.Fatal("expected an error")
 	}
-	if !strings.Contains(err.Error(), "blockservice: key not found") {
+	if !ipld.IsNotFound(err) {
 		t.Errorf("unxepected error: %s", err.Error())
 	}
 }