diff --git a/pkg/vm/stack_item.go b/pkg/vm/stack_item.go
index b00d32383..27ec00621 100644
--- a/pkg/vm/stack_item.go
+++ b/pkg/vm/stack_item.go
@@ -23,6 +23,10 @@ func makeStackItem(v interface{}) StackItem {
 		return &BigIntegerItem{
 			value: big.NewInt(val),
 		}
+	case uint32:
+		return &BigIntegerItem{
+			value: big.NewInt(int64(val)),
+		}
 	case []byte:
 		return &ByteArrayItem{
 			value: val,