diff --git a/l2tpns.h b/l2tpns.h
index b6eccf0..1cc2c3e 100644
--- a/l2tpns.h
+++ b/l2tpns.h
@@ -984,8 +984,8 @@ void lac_tunnelshutdown(tunnelidt t, char *reason, int result, int error, char *
 
 #undef LOG
 #undef LOG_HEX
-#define LOG(D, s, t, f, ...)	({ if (D <= config->debug) _log(D, s, t, f, ## __VA_ARGS__); })
-#define LOG_HEX(D, t, d, s)	({ if (D <= config->debug) _log_hex(D, t, d, s); })
+#define LOG(D, s, t, f, ...)	({ if ((D) <= config->debug) _log((D), s, t, f, ## __VA_ARGS__); })
+#define LOG_HEX(D, t, d, s)	({ if ((D) <= config->debug) _log_hex((D), t, d, s); })
 
 void _log(int level, sessionidt s, tunnelidt t, const char *format, ...) __attribute__((format (printf, 4, 5)));
 void _log_hex(int level, const char *title, const uint8_t *data, int maxsize);