diff --git a/tqdbusmarshall.cpp b/tqdbusmarshall.cpp
index a1177bb..6d92d8a 100644
--- a/tqdbusmarshall.cpp
+++ b/tqdbusmarshall.cpp
@@ -233,6 +233,10 @@ static TQValueList<TQT_DBusData> parseSignature(TQCString& signature)
                 {
                     switch (elementType)
                     {
+                        case TQT_DBusData::Bool:
+                            result << TQT_DBusData::fromBool(
+                                (0));
+                            break;
                         case TQT_DBusData::Byte:
                             result << TQT_DBusData::fromByte(
                                 (0));