diff --git a/br/pkg/storage/gcs.go b/br/pkg/storage/gcs.go
index 07ce5c8a862b9..e4835e0eb6111 100644
--- a/br/pkg/storage/gcs.go
+++ b/br/pkg/storage/gcs.go
@@ -180,11 +180,6 @@ func (s *gcsStorage) WalkDir(ctx context.Context, opt *WalkOption, fn func(strin
 		opt = &WalkOption{}
 	}
 
-	maxKeys := int64(1000)
-	if opt.ListCount > 0 {
-		maxKeys = opt.ListCount
-	}
-
 	prefix := path.Join(s.gcs.Prefix, opt.SubDir)
 	if len(prefix) > 0 && !strings.HasSuffix(prefix, "/") {
 		prefix += "/"
@@ -194,7 +189,7 @@ func (s *gcsStorage) WalkDir(ctx context.Context, opt *WalkOption, fn func(strin
 	// only need each object's name and size
 	query.SetAttrSelection([]string{"Name", "Size"})
 	iter := s.bucket.Objects(ctx, query)
-	for i := int64(0); i != maxKeys; i++ {
+	for {
 		attrs, err := iter.Next()
 		if err == iterator.Done {
 			break
diff --git a/br/pkg/storage/gcs_test.go b/br/pkg/storage/gcs_test.go
index c3e63d6d410a2..ccf3927497bea 100644
--- a/br/pkg/storage/gcs_test.go
+++ b/br/pkg/storage/gcs_test.go
@@ -4,6 +4,7 @@ package storage
 
 import (
 	"context"
+	"fmt"
 	"io"
 	"os"
 
@@ -95,6 +96,31 @@ func (r *testStorageSuite) TestGCS(c *C) {
 	c.Assert(list, Equals, "keykey1key2")
 	c.Assert(totalSize, Equals, int64(42))
 
+	// test 1003 files
+	totalSize = 0
+	for i := 0; i < 1000; i += 1 {
+		err = stg.WriteFile(ctx, fmt.Sprintf("f%d", i), []byte("data"))
+		c.Assert(err, IsNil)
+	}
+	filesSet := make(map[string]struct{}, 1003)
+	err = stg.WalkDir(ctx, nil, func(name string, size int64) error {
+		filesSet[name] = struct{}{}
+		totalSize += size
+		return nil
+	})
+	c.Assert(err, IsNil)
+	c.Assert(totalSize, Equals, int64(42+4000))
+	_, ok := filesSet["key"]
+	c.Assert(ok, IsTrue)
+	_, ok = filesSet["key1"]
+	c.Assert(ok, IsTrue)
+	_, ok = filesSet["key2"]
+	c.Assert(ok, IsTrue)
+	for i := 0; i < 1000; i += 1 {
+		_, ok = filesSet[fmt.Sprintf("f%d", i)]
+		c.Assert(ok, IsTrue)
+	}
+
 	efr, err := stg.Open(ctx, "key2")
 	c.Assert(err, IsNil)