diff --git a/pkg/vm/vm.go b/pkg/vm/vm.go
index 006511f31..666e2f30b 100644
--- a/pkg/vm/vm.go
+++ b/pkg/vm/vm.go
@@ -1461,12 +1461,12 @@ func (v *VM) execute(ctx *Context, op opcode.Opcode, parameter []byte) (err erro
 			res = index < len(c.Array())
 		case *stackitem.Map:
 			res = t.Has(key.Item())
-		case *stackitem.Buffer:
+		case *stackitem.Buffer, *stackitem.ByteArray:
 			index := toInt(key.BigInt())
 			if index < 0 {
 				panic("negative index")
 			}
-			res = index < t.Len()
+			res = index < len(t.Value().([]byte))
 		default:
 			panic("wrong collection type")
 		}
diff --git a/pkg/vm/vm_test.go b/pkg/vm/vm_test.go
index af82328f9..1d0e107d2 100644
--- a/pkg/vm/vm_test.go
+++ b/pkg/vm/vm_test.go
@@ -1435,6 +1435,13 @@ func TestHASKEY(t *testing.T) {
 		t.Run("False", getTestFuncForVM(prog, false, stackitem.NewBuffer([]byte{5, 5, 5}), 3))
 		t.Run("Negative", getTestFuncForVM(prog, nil, stackitem.NewBuffer([]byte{5, 5, 5}), -1))
 	})
+
+	t.Run("ByteArray", func(t *testing.T) {
+		t.Run("True", getTestFuncForVM(prog, true, stackitem.NewByteArray([]byte{5, 5, 5}), 2))
+		t.Run("too big", getTestFuncForVM(prog, nil, stackitem.NewByteArray([]byte{5, 5, 5}), maxu64Plus(2)))
+		t.Run("False", getTestFuncForVM(prog, false, stackitem.NewByteArray([]byte{5, 5, 5}), 3))
+		t.Run("Negative", getTestFuncForVM(prog, nil, stackitem.NewByteArray([]byte{5, 5, 5}), -1))
+	})
 }
 
 func TestHASKEYMap(t *testing.T) {