diff --git a/registry/client/auth/session_test.go b/registry/client/auth/session_test.go
index 4f54c75cc4..c857ec815a 100644
--- a/registry/client/auth/session_test.go
+++ b/registry/client/auth/session_test.go
@@ -466,7 +466,7 @@ func TestEndpointAuthorizeTokenBasic(t *testing.T) {
 		},
 	})
 
-	authenicate1 := fmt.Sprintf("Basic realm=localhost")
+	authenicate1 := "Basic realm=localhost"
 	basicCheck := func(a string) bool {
 		return a == fmt.Sprintf("Basic %s", basicAuth(username, password))
 	}
@@ -546,7 +546,7 @@ func TestEndpointAuthorizeTokenBasicWithExpiresIn(t *testing.T) {
 		},
 	})
 
-	authenicate1 := fmt.Sprintf("Basic realm=localhost")
+	authenicate1 := "Basic realm=localhost"
 	tokenExchanges := 0
 	basicCheck := func(a string) bool {
 		tokenExchanges = tokenExchanges + 1
@@ -706,7 +706,7 @@ func TestEndpointAuthorizeTokenBasicWithExpiresInAndIssuedAt(t *testing.T) {
 		},
 	})
 
-	authenicate1 := fmt.Sprintf("Basic realm=localhost")
+	authenicate1 := "Basic realm=localhost"
 	tokenExchanges := 0
 	basicCheck := func(a string) bool {
 		tokenExchanges = tokenExchanges + 1
@@ -835,7 +835,7 @@ func TestEndpointAuthorizeBasic(t *testing.T) {
 
 	username := "user1"
 	password := "funSecretPa$$word"
-	authenicate := fmt.Sprintf("Basic realm=localhost")
+	authenicate := "Basic realm=localhost"
 	validCheck := func(a string) bool {
 		return a == fmt.Sprintf("Basic %s", basicAuth(username, password))
 	}
diff --git a/registry/client/blob_writer_test.go b/registry/client/blob_writer_test.go
index 099dca4f01..f4469b6f5c 100644
--- a/registry/client/blob_writer_test.go
+++ b/registry/client/blob_writer_test.go
@@ -8,7 +8,7 @@ import (
 
 	"github.com/docker/distribution"
 	"github.com/docker/distribution/registry/api/errcode"
-	"github.com/docker/distribution/registry/api/v2"
+	v2 "github.com/docker/distribution/registry/api/v2"
 	"github.com/docker/distribution/testutil"
 )
 
diff --git a/registry/client/repository_test.go b/registry/client/repository_test.go
index 53b53cce6e..e142fc21b3 100644
--- a/registry/client/repository_test.go
+++ b/registry/client/repository_test.go
@@ -22,7 +22,7 @@ import (
 	"github.com/docker/distribution/manifest/schema1"
 	"github.com/docker/distribution/reference"
 	"github.com/docker/distribution/registry/api/errcode"
-	"github.com/docker/distribution/registry/api/v2"
+	v2 "github.com/docker/distribution/registry/api/v2"
 	"github.com/docker/distribution/testutil"
 	"github.com/docker/distribution/uuid"
 	"github.com/docker/libtrust"
diff --git a/registry/handlers/blobupload.go b/registry/handlers/blobupload.go
index b6bfe3022e..53ffbe8ccf 100644
--- a/registry/handlers/blobupload.go
+++ b/registry/handlers/blobupload.go
@@ -9,7 +9,7 @@ import (
 	dcontext "github.com/docker/distribution/context"
 	"github.com/docker/distribution/reference"
 	"github.com/docker/distribution/registry/api/errcode"
-	"github.com/docker/distribution/registry/api/v2"
+	v2 "github.com/docker/distribution/registry/api/v2"
 	"github.com/docker/distribution/registry/storage"
 	"github.com/gorilla/handlers"
 	"github.com/opencontainers/go-digest"
diff --git a/script/validate/dco b/script/validate/dco
index d9a0cb29b7..7b15eacf14 100755
--- a/script/validate/dco
+++ b/script/validate/dco
@@ -9,5 +9,4 @@ if ! command -v git-validation; then
 fi
 
 verbosity="${DCO_VERBOSITY--v}"
-echo $COMMIT_RANGE
 GIT_CHECK_EXCLUDE="./vendor:./script/validate/template" git-validation "$verbosity" -range "5b98226afefa11a06ef0c652af4995177c0efda0..HEAD" -run DCO,short-subject,dangling-whitespace
\ No newline at end of file