diff --git a/cmd/service_add.go b/cmd/service_add.go
index 0bf671d..3360faa 100644
--- a/cmd/service_add.go
+++ b/cmd/service_add.go
@@ -27,11 +27,11 @@ import (
 
 	"github.com/manifoldco/promptui"
 	"github.com/spf13/cobra"
+	"go.uploadedlobster.com/scotty/internal/auth"
 	"go.uploadedlobster.com/scotty/internal/backends"
 	"go.uploadedlobster.com/scotty/internal/cli"
 	"go.uploadedlobster.com/scotty/internal/config"
 	"go.uploadedlobster.com/scotty/internal/i18n"
-	"go.uploadedlobster.com/scotty/internal/models"
 )
 
 var serviceAddCmd = &cobra.Command{
@@ -95,7 +95,7 @@ func init() {
 }
 
 func promptForAuth(service config.ServiceConfig) error {
-	backend, err := backends.ResolveBackend[models.OAuth2Authenticator](service)
+	backend, err := backends.ResolveBackend[auth.OAuth2Authenticator](service)
 	if err != nil {
 		// No authentication required, return
 		return nil
diff --git a/cmd/service_auth.go b/cmd/service_auth.go
index ddab35d..0a075c5 100644
--- a/cmd/service_auth.go
+++ b/cmd/service_auth.go
@@ -18,9 +18,9 @@ package cmd
 
 import (
 	"github.com/spf13/cobra"
+	"go.uploadedlobster.com/scotty/internal/auth"
 	"go.uploadedlobster.com/scotty/internal/backends"
 	"go.uploadedlobster.com/scotty/internal/cli"
-	"go.uploadedlobster.com/scotty/internal/models"
 )
 
 var serviceAuthCmd = &cobra.Command{
@@ -33,7 +33,7 @@ multiple services using the same backend but different authentication.`,
 	Run: func(cmd *cobra.Command, args []string) {
 		serviceConfig, err := cli.SelectService(cmd)
 		cobra.CheckErr(err)
-		backend, err := backends.ResolveBackend[models.OAuth2Authenticator](serviceConfig)
+		backend, err := backends.ResolveBackend[auth.OAuth2Authenticator](serviceConfig)
 		cobra.CheckErr(err)
 		cli.AuthenticationFlow(serviceConfig, backend)
 	},
diff --git a/internal/auth/auth.go b/internal/auth/auth.go
new file mode 100644
index 0000000..5ba05af
--- /dev/null
+++ b/internal/auth/auth.go
@@ -0,0 +1,34 @@
+/*
+Copyright © 2023 Philipp Wolfer <phw@uploadedlobster.com>
+
+Scotty is free software: you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software
+Foundation, either version 3 of the License, or (at your option) any later version.
+
+Scotty is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+Scotty. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+package auth
+
+import (
+	"net/url"
+
+	"go.uploadedlobster.com/scotty/internal/models"
+	"golang.org/x/oauth2"
+)
+
+// Must be implemented by backends requiring OAuth2 authentication
+type OAuth2Authenticator interface {
+	models.Backend
+
+	// Returns OAuth2 config suitable for this backend
+	OAuth2Strategy(redirectUrl *url.URL) OAuth2Strategy
+
+	// Setup the OAuth2 client
+	OAuth2Setup(token oauth2.TokenSource) error
+}
diff --git a/internal/backends/auth.go b/internal/backends/auth.go
index d27efd6..c17e9ba 100644
--- a/internal/backends/auth.go
+++ b/internal/backends/auth.go
@@ -37,7 +37,7 @@ func BuildRedirectURL(config *viper.Viper, backend string) (*url.URL, error) {
 }
 
 func Authenticate(service string, backend models.Backend, db storage.Database, config *viper.Viper) (bool, error) {
-	authenticator, needAuth := backend.(models.OAuth2Authenticator)
+	authenticator, needAuth := backend.(auth.OAuth2Authenticator)
 	if needAuth {
 		redirectURL, err := BuildRedirectURL(config, backend.Name())
 		if err != nil {
diff --git a/internal/cli/auth.go b/internal/cli/auth.go
index fc5c889..828651a 100644
--- a/internal/cli/auth.go
+++ b/internal/cli/auth.go
@@ -26,12 +26,11 @@ import (
 	"go.uploadedlobster.com/scotty/internal/backends"
 	"go.uploadedlobster.com/scotty/internal/config"
 	"go.uploadedlobster.com/scotty/internal/i18n"
-	"go.uploadedlobster.com/scotty/internal/models"
 	"go.uploadedlobster.com/scotty/internal/storage"
 	"golang.org/x/oauth2"
 )
 
-func AuthenticationFlow(service config.ServiceConfig, backend models.OAuth2Authenticator) {
+func AuthenticationFlow(service config.ServiceConfig, backend auth.OAuth2Authenticator) {
 	redirectURL, err := backends.BuildRedirectURL(viper.GetViper(), backend.Name())
 	cobra.CheckErr(err)
 
diff --git a/internal/models/interfaces.go b/internal/models/interfaces.go
index cc52ead..cc19d8d 100644
--- a/internal/models/interfaces.go
+++ b/internal/models/interfaces.go
@@ -17,12 +17,10 @@ Scotty. If not, see <https://www.gnu.org/licenses/>.
 package models
 
 import (
-	"net/url"
 	"time"
 
-	"go.uploadedlobster.com/scotty/internal/auth"
+	// "go.uploadedlobster.com/scotty/internal/auth"
 	"go.uploadedlobster.com/scotty/internal/config"
-	"golang.org/x/oauth2"
 )
 
 // A listen service backend.
@@ -85,14 +83,3 @@ type LovesImport interface {
 	// Imports the given list of loves.
 	ImportLoves(export LovesResult, importResult ImportResult, progress chan Progress) (ImportResult, error)
 }
-
-// Must be implemented by backends requiring OAuth2 authentication
-type OAuth2Authenticator interface {
-	Backend
-
-	// Returns OAuth2 config suitable for this backend
-	OAuth2Strategy(redirectUrl *url.URL) auth.OAuth2Strategy
-
-	// Setup the OAuth2 client
-	OAuth2Setup(token oauth2.TokenSource) error
-}