diff --git a/client/errors.go b/client/errors.go
index e5a8a865f9..67a6babda7 100644
--- a/client/errors.go
+++ b/client/errors.go
@@ -58,14 +58,6 @@ func (e objectNotFoundError) Error() string {
 	return fmt.Sprintf("Error: No such %s: %s", e.object, e.id)
 }
 
-// IsErrUnauthorized returns true if the error is caused
-// when a remote registry authentication fails
-//
-// Deprecated: use errdefs.IsUnauthorized
-func IsErrUnauthorized(err error) bool {
-	return errdefs.IsUnauthorized(err)
-}
-
 type pluginPermissionDenied struct {
 	name string
 }
@@ -74,15 +66,6 @@ func (e pluginPermissionDenied) Error() string {
 	return "Permission denied while installing plugin " + e.name
 }
 
-// IsErrNotImplemented returns true if the error is a NotImplemented error.
-// This is returned by the API when a requested feature has not been
-// implemented.
-//
-// Deprecated: use errdefs.IsNotImplemented
-func IsErrNotImplemented(err error) bool {
-	return errdefs.IsNotImplemented(err)
-}
-
 // NewVersionError returns an error if the APIVersion required
 // if less than the current supported version
 func (cli *Client) NewVersionError(APIrequired, feature string) error {