diff --git a/object/sign.go b/object/sign.go
index 1ed3efa..def7bc3 100644
--- a/object/sign.go
+++ b/object/sign.go
@@ -82,6 +82,8 @@ func (m HeadRequest) ReadSignedData(p []byte) (int, error) {
 
 	if m.GetFullHeaders() {
 		p[0] = 1
+	} else {
+		p[0] = 0
 	}
 
 	off := 1
diff --git a/object/sign_test.go b/object/sign_test.go
index 4df1c2b..abf4549 100644
--- a/object/sign_test.go
+++ b/object/sign_test.go
@@ -1,6 +1,7 @@
 package object
 
 import (
+	"crypto/rand"
 	"testing"
 
 	"github.com/nspcc-dev/neofs-api-go/service"
@@ -187,3 +188,34 @@ func TestSignVerifyRequests(t *testing.T) {
 		}
 	}
 }
+
+func TestHeadRequest_ReadSignedData(t *testing.T) {
+	t.Run("full headers", func(t *testing.T) {
+		req := new(HeadRequest)
+
+		// unset FullHeaders flag
+		req.SetFullHeaders(false)
+
+		// allocate two different buffers for reading
+		buf1 := testData(t, req.SignedDataSize())
+		buf2 := testData(t, req.SignedDataSize())
+
+		// read to both buffers
+		n1, err := req.ReadSignedData(buf1)
+		require.NoError(t, err)
+
+		n2, err := req.ReadSignedData(buf2)
+		require.NoError(t, err)
+
+		require.Equal(t, buf1[:n1], buf2[:n2])
+	})
+}
+
+func testData(t *testing.T, sz int) []byte {
+	data := make([]byte, sz)
+
+	_, err := rand.Read(data)
+	require.NoError(t, err)
+
+	return data
+}
diff --git a/object/types.go b/object/types.go
index c8d3f25..4edf5f4 100644
--- a/object/types.go
+++ b/object/types.go
@@ -386,3 +386,8 @@ func Stringify(dst io.Writer, obj *Object) error {
 
 	return nil
 }
+
+// SetFullHeaders is a FullHeaders field setter.
+func (m *HeadRequest) SetFullHeaders(v bool) {
+	m.FullHeaders = v
+}