diff --git a/modules/git/repo.go b/modules/git/repo.go
index 8ba3ae4fda..9dd67c71cf 100644
--- a/modules/git/repo.go
+++ b/modules/git/repo.go
@@ -164,10 +164,8 @@ func CloneWithArgs(ctx context.Context, args []CmdArg, from, to string, opts Clo
 
 	envs := os.Environ()
 	u, err := url.Parse(from)
-	if err == nil && (strings.EqualFold(u.Scheme, "http") || strings.EqualFold(u.Scheme, "https")) {
-		if proxy.Match(u.Host) {
-			envs = append(envs, fmt.Sprintf("https_proxy=%s", proxy.GetProxyURL()))
-		}
+	if err == nil {
+		envs = proxy.EnvWithProxy(u)
 	}
 
 	stderr := new(bytes.Buffer)
diff --git a/modules/proxy/proxy.go b/modules/proxy/proxy.go
index 61730544b0..1dea0cf450 100644
--- a/modules/proxy/proxy.go
+++ b/modules/proxy/proxy.go
@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"strings"
 	"sync"
 
 	"code.gitea.io/gitea/modules/log"
@@ -83,3 +84,16 @@ func Proxy() func(req *http.Request) (*url.URL, error) {
 		return http.ProxyFromEnvironment(req)
 	}
 }
+
+// EnvWithProxy returns os.Environ(), with a https_proxy env, if the given url
+// needs to be proxied.
+func EnvWithProxy(u *url.URL) []string {
+	envs := os.Environ()
+	if strings.EqualFold(u.Scheme, "http") || strings.EqualFold(u.Scheme, "https") {
+		if Match(u.Host) {
+			envs = append(envs, "https_proxy="+GetProxyURL())
+		}
+	}
+
+	return envs
+}
diff --git a/services/mirror/mirror_pull.go b/services/mirror/mirror_pull.go
index 6002e6b8ed..ac9c9cc76d 100644
--- a/services/mirror/mirror_pull.go
+++ b/services/mirror/mirror_pull.go
@@ -19,6 +19,7 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/notification"
 	"code.gitea.io/gitea/modules/process"
+	"code.gitea.io/gitea/modules/proxy"
 	repo_module "code.gitea.io/gitea/modules/repository"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/timeutil"
@@ -216,6 +217,8 @@ func runSync(ctx context.Context, m *repo_model.Mirror) ([]*mirrorSyncResult, bo
 		return nil, false
 	}
 
+	envs := proxy.EnvWithProxy(remoteURL.URL)
+
 	stdoutBuilder := strings.Builder{}
 	stderrBuilder := strings.Builder{}
 	if err := git.NewCommand(ctx, gitArgs...).
@@ -223,6 +226,7 @@ func runSync(ctx context.Context, m *repo_model.Mirror) ([]*mirrorSyncResult, bo
 		Run(&git.RunOpts{
 			Timeout: timeout,
 			Dir:     repoPath,
+			Env:     envs,
 			Stdout:  &stdoutBuilder,
 			Stderr:  &stderrBuilder,
 		}); err != nil {