diff --git a/pkg/morph/event/container/put.go b/pkg/morph/event/container/put.go
index 9bf7ee35..8f6d6c09 100644
--- a/pkg/morph/event/container/put.go
+++ b/pkg/morph/event/container/put.go
@@ -15,6 +15,8 @@ type Put struct {
 	publicKey    []byte
 }
 
+const expectedItemNumPut = 4
+
 // MorphEvent implements Neo:Morph Event interface.
 func (Put) MorphEvent() {}
 
@@ -34,8 +36,8 @@ func ParsePut(params []stackitem.Item) (event.Event, error) {
 		err error
 	)
 
-	if ln := len(params); ln != 3 {
-		return nil, event.WrongNumberOfParameters(3, ln)
+	if ln := len(params); ln != expectedItemNumPut {
+		return nil, event.WrongNumberOfParameters(expectedItemNumPut, ln)
 	}
 
 	// parse container
diff --git a/pkg/morph/event/container/put_test.go b/pkg/morph/event/container/put_test.go
index 75bce11e..bdc9a4bd 100644
--- a/pkg/morph/event/container/put_test.go
+++ b/pkg/morph/event/container/put_test.go
@@ -22,7 +22,7 @@ func TestParsePut(t *testing.T) {
 		}
 
 		_, err := ParsePut(prms)
-		require.EqualError(t, err, event.WrongNumberOfParameters(3, len(prms)).Error())
+		require.EqualError(t, err, event.WrongNumberOfParameters(expectedItemNumPut, len(prms)).Error())
 	})
 
 	t.Run("wrong container parameter", func(t *testing.T) {
@@ -57,6 +57,7 @@ func TestParsePut(t *testing.T) {
 			stackitem.NewByteArray(containerData),
 			stackitem.NewByteArray(signature),
 			stackitem.NewByteArray(publicKey),
+			stackitem.NewMap(),
 		})
 		require.NoError(t, err)