diff --git a/backends/swiften/main.cpp b/backends/swiften/main.cpp
index 8ed12331503d38d9f8e2b83cb72e8e732e1c9138..517da09e7fe4dd67bef1eb032d404cf3c8b4b5a6 100644
--- a/backends/swiften/main.cpp
+++ b/backends/swiften/main.cpp
@@ -8,7 +8,7 @@
 // Swiften
 #include "Swiften/Swiften.h"
 #include <Swiften/Version.h>
-#define HAVE_SWIFTEN_3  SWIFTEN_VERSION >= 0x030000
+#define HAVE_SWIFTEN_3  (SWIFTEN_VERSION >= 0x030000)
 
 #ifndef WIN32
 // for signal handler