diff --git a/freebsd/netinet/libalias/alias_sctp.c b/freebsd/netinet/libalias/alias_sctp.c
index 67e475402..08d8b4d78 100644
--- a/freebsd/netinet/libalias/alias_sctp.c
+++ b/freebsd/netinet/libalias/alias_sctp.c
@@ -185,7 +185,7 @@ static MALLOC_DEFINE(M_SCTPNAT, "sctpnat", "sctp nat dbs");
 /* Use kernel allocator. */
 #ifdef _SYS_MALLOC_H_
 #define	sn_malloc(x)	malloc(x, M_SCTPNAT, M_NOWAIT|M_ZERO)
-#define	sn_calloc(n,x)	sn_malloc(x * n)
+#define	sn_calloc(n,x)	sn_malloc((x) * (n))
 #define	sn_free(x)	free(x, M_SCTPNAT)
 #endif// #ifdef _SYS_MALLOC_H_