diff --git a/sys/net/bridgestp.c b/sys/net/bridgestp.c
index 5007281f0eb..264844c4b14 100644
--- a/sys/net/bridgestp.c
+++ b/sys/net/bridgestp.c
@@ -68,7 +68,7 @@ __FBSDID("$FreeBSD$");
 #ifdef	BRIDGESTP_DEBUG
 #define	DPRINTF(fmt, arg...)	printf("bstp: " fmt, ##arg)
 #else
-#define	DPRINTF(fmt, arg...)
+#define	DPRINTF(fmt, arg...)	(void)0
 #endif
 
 #define	PV2ADDR(pv, eaddr)	do {		\