diff --git a/routers/web/repo/pull.go b/routers/web/repo/pull.go
index c9a2bb4e08..48e132df5c 100644
--- a/routers/web/repo/pull.go
+++ b/routers/web/repo/pull.go
@@ -1152,7 +1152,7 @@ func viewPullFiles(ctx *context.Context, specifiedStartCommit, specifiedEndCommi
 			ctx.ServerError("GetUserRepoPermission", err)
 			return
 		}
-		ctx.Data["HeadBranchIsEditable"] = pull.HeadRepo.CanEnableEditor() && issues_model.CanMaintainerWriteToBranch(ctx, headRepoPerm, pull.HeadBranch, ctx.Doer)
+		ctx.Data["HeadBranchIsEditable"] = pull.HeadRepo.CanEnableEditor() && issues_model.CanMaintainerWriteToBranch(ctx, headRepoPerm, pull.HeadBranch, ctx.Doer) && pull.Flow != issues_model.PullRequestFlowAGit
 		ctx.Data["SourceRepoLink"] = pull.HeadRepo.Link()
 		ctx.Data["HeadBranch"] = pull.HeadBranch
 	}
diff --git a/tests/integration/pull_diff_test.go b/tests/integration/pull_diff_test.go
index 6db9fc25d8..7442909aec 100644
--- a/tests/integration/pull_diff_test.go
+++ b/tests/integration/pull_diff_test.go
@@ -4,32 +4,45 @@
 package integration
 
 import (
+	"fmt"
 	"net/http"
+	"net/url"
+	"os"
+	"path"
+	"strings"
 	"testing"
+	"time"
 
+	issues_model "forgejo.org/models/issues"
+	unit_model "forgejo.org/models/unit"
+	"forgejo.org/models/unittest"
+	user_model "forgejo.org/models/user"
+	"forgejo.org/modules/git"
+	files_service "forgejo.org/services/repository/files"
 	"forgejo.org/tests"
 
 	"github.com/PuerkitoBio/goquery"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestPullDiff_CompletePRDiff(t *testing.T) {
-	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/files", []string{"test1.txt", "test10.txt", "test2.txt", "test3.txt", "test4.txt", "test5.txt", "test6.txt", "test7.txt", "test8.txt", "test9.txt"})
+	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/files", []string{"test1.txt", "test10.txt", "test2.txt", "test3.txt", "test4.txt", "test5.txt", "test6.txt", "test7.txt", "test8.txt", "test9.txt"}, true)
 }
 
 func TestPullDiff_SingleCommitPRDiff(t *testing.T) {
-	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/commits/c5626fc9eff57eb1bb7b796b01d4d0f2f3f792a2", []string{"test3.txt"})
+	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/commits/c5626fc9eff57eb1bb7b796b01d4d0f2f3f792a2", []string{"test3.txt"}, true)
 }
 
 func TestPullDiff_CommitRangePRDiff(t *testing.T) {
-	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/files/4ca8bcaf27e28504df7bf996819665986b01c847..23576dd018294e476c06e569b6b0f170d0558705", []string{"test2.txt", "test3.txt", "test4.txt"})
+	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/files/4ca8bcaf27e28504df7bf996819665986b01c847..23576dd018294e476c06e569b6b0f170d0558705", []string{"test2.txt", "test3.txt", "test4.txt"}, true)
 }
 
 func TestPullDiff_StartingFromBaseToCommitPRDiff(t *testing.T) {
-	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/files/c5626fc9eff57eb1bb7b796b01d4d0f2f3f792a2", []string{"test1.txt", "test2.txt", "test3.txt"})
+	doTestPRDiff(t, "/user2/commitsonpr/pulls/1/files/c5626fc9eff57eb1bb7b796b01d4d0f2f3f792a2", []string{"test1.txt", "test2.txt", "test3.txt"}, true)
 }
 
-func doTestPRDiff(t *testing.T, prDiffURL string, expectedFilenames []string) {
+func doTestPRDiff(t *testing.T, prDiffURL string, expectedFilenames []string, editable bool) {
 	defer tests.PrepareTestEnv(t)()
 
 	session := loginUser(t, "user2")
@@ -51,5 +64,73 @@ func doTestPRDiff(t *testing.T, prDiffURL string, expectedFilenames []string) {
 	fileContents.Each(func(i int, s *goquery.Selection) {
 		filename, _ := s.Attr("data-old-filename")
 		assert.Equal(t, expectedFilenames[i], filename)
+		doc.AssertElement(t, "h4.diff-file-header a.button[href=\"/user2/commitsonpr/_edit/branch1/"+filename+"\"]", editable)
+	})
+}
+
+func TestPullDiff_AGitNotEditable(t *testing.T) {
+	onGiteaRun(t, func(t *testing.T, u *url.URL) {
+		user2 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+		session := loginUser(t, user2.Name)
+
+		// Create temporary repository.
+		repo, _, f := tests.CreateDeclarativeRepo(t, user2, "myrepo",
+			[]unit_model.Type{unit_model.TypePullRequests}, nil,
+			[]*files_service.ChangeRepoFile{
+				{
+					Operation:     "create",
+					TreePath:      "FUNFACT",
+					ContentReader: strings.NewReader("Smithy was the runner up to be Forgejo's name"),
+				},
+			},
+		)
+		defer f()
+
+		clone := func(t *testing.T, clone string) string {
+			t.Helper()
+
+			dstPath := t.TempDir()
+			cloneURL, _ := url.Parse(clone)
+			cloneURL.User = url.UserPassword("user2", userPassword)
+			require.NoError(t, git.CloneWithArgs(t.Context(), nil, cloneURL.String(), dstPath, git.CloneRepoOptions{}))
+
+			return dstPath
+		}
+
+		firstCommit := func(t *testing.T, dstPath string) {
+			t.Helper()
+
+			require.NoError(t, os.WriteFile(path.Join(dstPath, "README.md"), []byte("## test content"), 0o600))
+			require.NoError(t, git.AddChanges(dstPath, true))
+			require.NoError(t, git.CommitChanges(dstPath, git.CommitChangesOptions{
+				Committer: &git.Signature{
+					Email: "user2@example.com",
+					Name:  "user2",
+					When:  time.Now(),
+				},
+				Author: &git.Signature{
+					Email: "user2@example.com",
+					Name:  "user2",
+					When:  time.Now(),
+				},
+				Message: "Add README.",
+			}))
+		}
+		dstPath := clone(t, fmt.Sprintf("%suser2/%s.git", u.String(), repo.Name))
+
+		// Create first commit.
+		firstCommit(t, dstPath)
+
+		// Create agit PR.
+		require.NoError(t, git.NewCommand(t.Context(), "push", "origin", "HEAD:refs/for/main", "-o", "topic=agit-pr").Run(&git.RunOpts{Dir: dstPath}))
+
+		pr := unittest.AssertExistsAndLoadBean(t, &issues_model.PullRequest{Index: 1, BaseRepoID: repo.ID})
+		assert.Equal(t, issues_model.PullRequestFlowAGit, pr.Flow)
+
+		resp := session.MakeRequest(t, NewRequest(t, "GET", fmt.Sprintf("/%s/pulls/%d/files", repo.FullName(), pr.Index)), http.StatusOK)
+
+		doc := NewHTMLParser(t, resp.Body)
+		// There is no edit button on any changed file
+		doc.AssertElement(t, "h4.diff-file-header a.button[href^=\"/"+repo.FullName()+"/_edit\"]", false)
 	})
 }