diff --git a/integration/action-tests.go b/integration/action-tests.go
index 10265fd..659a765 100644
--- a/integration/action-tests.go
+++ b/integration/action-tests.go
@@ -74,6 +74,7 @@ func TestListObjects(s *S3Conf) {
 	ListObjects_invalid_max_keys(s)
 	ListObjects_max_keys_0(s)
 	ListObjects_delimiter(s)
+	ListObjects_max_keys_none(s)
 }
 
 func TestDeleteObject(s *S3Conf) {
diff --git a/integration/tests.go b/integration/tests.go
index b03cbf6..54779e4 100644
--- a/integration/tests.go
+++ b/integration/tests.go
@@ -1509,6 +1509,31 @@ func ListObjects_delimiter(s *S3Conf) {
 	})
 }
 
+func ListObjects_max_keys_none(s *S3Conf) {
+	testName := "ListObjects_max_keys_none"
+	actionHandler(s, testName, func(s3client *s3.Client, bucket string) error {
+		err := putObjects(s3client, []string{"foo", "bar", "baz"}, bucket)
+		if err != nil {
+			return err
+		}
+
+		ctx, cancel := context.WithTimeout(context.Background(), shortTimeout)
+		out, err := s3client.ListObjects(ctx, &s3.ListObjectsInput{
+			Bucket: &bucket,
+		})
+		cancel()
+		if err != nil {
+			return err
+		}
+
+		if out.MaxKeys != 1000 {
+			return fmt.Errorf("expected max-keys to be 1000, instead got %v", out.MaxKeys)
+		}
+
+		return nil
+	})
+}
+
 func DeleteObject_non_existing_object(s *S3Conf) {
 	testName := "DeleteObject_non_existing_object"
 	actionHandler(s, testName, func(s3client *s3.Client, bucket string) error {
diff --git a/s3api/utils/utils.go b/s3api/utils/utils.go
index 45a998b..3ac4f32 100644
--- a/s3api/utils/utils.go
+++ b/s3api/utils/utils.go
@@ -82,11 +82,11 @@ func SetMetaHeaders(ctx *fiber.Ctx, meta map[string]string) {
 
 func ParseUint(str string) (int32, error) {
 	if str == "" {
-		return -1, nil
+		return 1000, nil
 	}
 	num, err := strconv.ParseUint(str, 10, 16)
 	if err != nil {
-		return -1, s3err.GetAPIError(s3err.ErrInvalidMaxKeys)
+		return 1000, s3err.GetAPIError(s3err.ErrInvalidMaxKeys)
 	}
 	return int32(num), nil
 }
diff --git a/s3api/utils/utils_test.go b/s3api/utils/utils_test.go
index d473d0b..c830b36 100644
--- a/s3api/utils/utils_test.go
+++ b/s3api/utils/utils_test.go
@@ -237,7 +237,7 @@ func TestParseUint(t *testing.T) {
 			args: args{
 				str: "",
 			},
-			want:    -1,
+			want:    1000,
 			wantErr: false,
 		},
 		{
@@ -245,7 +245,7 @@ func TestParseUint(t *testing.T) {
 			args: args{
 				str: "bla",
 			},
-			want:    -1,
+			want:    1000,
 			wantErr: true,
 		},
 		{
@@ -253,9 +253,17 @@ func TestParseUint(t *testing.T) {
 			args: args{
 				str: "-5",
 			},
-			want:    -1,
+			want:    1000,
 			wantErr: true,
 		},
+		{
+			name: "Parse-uint-success",
+			args: args{
+				str: "23",
+			},
+			want:    23,
+			wantErr: false,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {