diff --git a/README.md b/README.md
index 35e946e..e2de62b 100644
--- a/README.md
+++ b/README.md
@@ -75,7 +75,7 @@ Configuration values can be supplied as environment variables, via a JSON config
 | `GBM_PROVIDER` | Git provider to use (`github` or `gitlab`). Defaults to `github`. |
 | `GBM_NAMESPACE` | Optional suffix added to the bookmarks repository name. |
 | `GBM_TITLE` | Overrides the page title shown in the browser. |
-| `GIT_SERVER` | Base URL for a self-hosted git provider, e.g. `https://gitlab.example.com` |
+| `GIT_SERVER` | Base URL for a self-hosted git provider, e.g. `https://gitlab.example.com`. Defaults to the public server for the selected provider. |
 | `GOBM_ENV_FILE` | Path to a file of `KEY=VALUE` pairs loaded before the environment. Defaults to `/etc/gobookmarks/gobookmarks.env`. |
 | `GOBM_CONFIG_FILE` | Path to the JSON config file. If unset the program uses `$XDG_CONFIG_HOME/gobookmarks/config.json` or `$HOME/.config/gobookmarks/config.json` for normal users and `/etc/gobookmarks/config.json` when run as root. |
 
@@ -86,7 +86,7 @@ Use `--config <path>` or set `GOBM_CONFIG_FILE` to control which configuration f
 
 The `--provider` command line flag or `GBM_PROVIDER` environment variable selects which git provider to use. By default the binary includes both GitHub and GitLab support. Use build tags `nogithub` or `nogitlab` to exclude either provider when building from source. If you specify an unknown provider the program will exit with an error listing the available options.
 The `--title` flag or `GBM_TITLE` environment variable sets the browser page title.
-Use `--git-server` or `GIT_SERVER` to point the application at a self-hosted git provider.
+Use `--git-server` or `GIT_SERVER` to override the base URL of the git provider (defaults to the provider's public server).
 
 Running `gobookmarks --version` will print the version information along with the list of compiled-in providers.
 Use `--dump-config` to print the final configuration after merging the environment,
diff --git a/provider.go b/provider.go
index 711f58f..3d0058b 100644
--- a/provider.go
+++ b/provider.go
@@ -36,6 +36,7 @@ type Provider interface {
 	GetBookmarks(ctx context.Context, user, ref string, token *oauth2.Token) (string, string, error)
 	UpdateBookmarks(ctx context.Context, user string, token *oauth2.Token, sourceRef, branch, text, expectSHA string) error
 	CreateBookmarks(ctx context.Context, user string, token *oauth2.Token, branch, text string) error
+	DefaultServer() string
 }
 
 var providers = map[string]Provider{}
@@ -58,7 +59,14 @@ var ActiveProvider Provider
 // It returns true if the provider exists.
 func SetProviderByName(name string) bool {
 	if p, ok := providers[name]; ok {
+		prevDefault := ""
+		if ActiveProvider != nil {
+			prevDefault = ActiveProvider.DefaultServer()
+		}
 		ActiveProvider = p
+		if GitServer == "" || GitServer == prevDefault {
+			GitServer = p.DefaultServer()
+		}
 		return true
 	}
 	return false
@@ -67,5 +75,8 @@ func SetProviderByName(name string) bool {
 func init() {
 	if p, ok := providers["github"]; ok {
 		ActiveProvider = p
+		if GitServer == "" {
+			GitServer = p.DefaultServer()
+		}
 	}
 }
diff --git a/provider_github.go b/provider_github.go
index 41d58f9..ccb91e9 100644
--- a/provider_github.go
+++ b/provider_github.go
@@ -6,10 +6,10 @@ import (
 	"context"
 	"encoding/base64"
 	"fmt"
+	"strings"
 
 	"github.com/google/go-github/v55/github"
 	"golang.org/x/oauth2"
-	"golang.org/x/oauth2/endpoints"
 )
 
 // GitHubProvider implements Provider for GitHub.
@@ -19,18 +19,36 @@ func init() { RegisterProvider(GitHubProvider{}) }
 
 func (GitHubProvider) Name() string { return "github" }
 
+func (GitHubProvider) DefaultServer() string { return "https://github.com" }
+
 func (GitHubProvider) OAuth2Config(clientID, clientSecret, redirectURL string) *oauth2.Config {
+	server := strings.TrimRight(GitServer, "/")
+	if server == "" {
+		server = "https://github.com"
+	}
 	return &oauth2.Config{
 		ClientID:     clientID,
 		ClientSecret: clientSecret,
 		RedirectURL:  redirectURL,
 		Scopes:       []string{"repo", "read:user", "user:email"},
-		Endpoint:     endpoints.GitHub,
+		Endpoint: oauth2.Endpoint{
+			AuthURL:  server + "/login/oauth/authorize",
+			TokenURL: server + "/login/oauth/access_token",
+		},
 	}
 }
 
 func (GitHubProvider) client(ctx context.Context, token *oauth2.Token) *github.Client {
-	return github.NewClient(oauth2.NewClient(ctx, oauth2.StaticTokenSource(token)))
+	httpClient := oauth2.NewClient(ctx, oauth2.StaticTokenSource(token))
+	server := strings.TrimRight(GitServer, "/")
+	if server == "" || server == "https://github.com" {
+		return github.NewClient(httpClient)
+	}
+	c, err := github.NewEnterpriseClient(server+"/api/v3/", server+"/upload/v3/", httpClient)
+	if err != nil {
+		return github.NewClient(httpClient)
+	}
+	return c
 }
 
 func (p GitHubProvider) CurrentUser(ctx context.Context, token *oauth2.Token) (*User, error) {
diff --git a/provider_gitlab.go b/provider_gitlab.go
index e84f23f..ff5417c 100644
--- a/provider_gitlab.go
+++ b/provider_gitlab.go
@@ -22,6 +22,8 @@ func init() { RegisterProvider(GitLabProvider{}) }
 
 func (GitLabProvider) Name() string { return "gitlab" }
 
+func (GitLabProvider) DefaultServer() string { return "https://gitlab.com" }
+
 func (GitLabProvider) OAuth2Config(clientID, clientSecret, redirectURL string) *oauth2.Config {
 	server := strings.TrimRight(GitServer, "/")
 	if server == "" {
diff --git a/settings.go b/settings.go
index dd6f0e1..eeb4bad 100644
--- a/settings.go
+++ b/settings.go
@@ -4,5 +4,5 @@ var (
 	UseCssColumns bool
 	Namespace     string
 	SiteTitle     string
-	GitServer     string = "https://gitlab.com"
+	GitServer     string
 )