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-rw-r--r--dbus/dbus-protocol.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/dbus/dbus-protocol.h b/dbus/dbus-protocol.h
index 04988862..dcb7a042 100644
--- a/dbus/dbus-protocol.h
+++ b/dbus/dbus-protocol.h
@@ -61,6 +61,7 @@ extern "C" {
#define DBUS_MAXIMUM_NAME_LENGTH 256
/* Types of message */
+#define DBUS_MESSAGE_TYPE_INVALID 0
#define DBUS_MESSAGE_TYPE_METHOD_CALL 1
#define DBUS_MESSAGE_TYPE_METHOD_RETURN 2
#define DBUS_MESSAGE_TYPE_ERROR 3