diff --git a/src/config.h.in b/src/config.h.in
index 82e0421..8589765 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -1,27 +1,27 @@
 /*
     SnoreToast is capable to invoke Windows 8 toast notifications.
     Copyright (C) 2019  Hannah von Reth <vonreth@kde.org>
 
     SnoreToast is free software: you can redistribute it and/or modify
     it under the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
 
     SnoreToast is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU Lesser General Public License for more details.
 
     You should have received a copy of the GNU Lesser General Public License
     along with SnoreToast.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #pragma once
 
 
 #define SNORETOAST_VERSION_MAJOR @PROJECT_VERSION_MAJOR@
 #define SNORETOAST_VERSION_MINOR @PROJECT_VERSION_MINOR@
 #define SNORETOAST_VERSION_PATCH @PROJECT_VERSION_PATCH@
 
 
-#define SNORETOAST_CALLBACK_GUID "@SNORETOAST_CALLBACK_GUID@"
+#define SNORETOAST_CALLBACK_GUID "{@SNORETOAST_CALLBACK_GUID@}"