diff --git a/plc4go/protocols/opcua/readwrite/model/PascalString.go b/plc4go/protocols/opcua/readwrite/model/PascalString.go
index 76869c092f1..901e444ff58 100644
--- a/plc4go/protocols/opcua/readwrite/model/PascalString.go
+++ b/plc4go/protocols/opcua/readwrite/model/PascalString.go
@@ -112,7 +112,7 @@ func (m *_PascalString) GetLengthInBits(ctx context.Context) uint16 {
 
 	// Optional Field (stringValue)
 	if m.StringValue != nil {
-		lengthInBits += -1
+		lengthInBits += 0
 	}
 
 	return lengthInBits