diff --git a/src/main.cpp b/src/main.cpp
index 6e2f5e4..b4b9317 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -51,6 +51,10 @@
 #define TD_DIST_VERSION PACKAGE_VERSION
 #endif
 
+#ifndef G_SOURCE_FUNC
+#define G_SOURCE_FUNC(f) ((GSourceFunc) (void (*)(void)) (f))
+#endif
+
 #define EXIT_UNSUPPORTED 2
 
 extern int thd_dbus_server_init(gboolean (*exit_handler)(void));