diff --git a/include/Swiften/Server/ServerFromClientSession.h b/include/Swiften/Server/ServerFromClientSession.h
index 674b54fef0e3041f14b8305a690f1bc11aa13df1..4496bdf1465b808bbbdc8d45468d10a66b1e8ca1 100644
--- a/include/Swiften/Server/ServerFromClientSession.h
+++ b/include/Swiften/Server/ServerFromClientSession.h
@@ -17,7 +17,7 @@
 #include <Swiften/Base/ByteArray.h>
 #include <Swiften/TLS/CertificateWithKey.h>
 #include <Swiften/Version.h>
-#define HAVE_SWIFTEN_3  SWIFTEN_VERSION >= 0x030000
+#define HAVE_SWIFTEN_3  (SWIFTEN_VERSION >= 0x030000)
 
 namespace Swift {
 	class ProtocolHeader;