diff --git a/pcap-dlpi.c b/pcap-dlpi.c
index 16fbfff..8f938fe 100644
--- a/pcap-dlpi.c
+++ b/pcap-dlpi.c
@@ -180,6 +180,12 @@ static struct strbuf ctl = {
 	(char *)ctlbuf
 };
 
+/*
+ * Cast a buffer to "union DL_primitives" without provoking warnings
+ * from the compiler.
+ */
+#define MAKE_DL_PRIMITIVES(ptr)	((union DL_primitives *)(void *)(ptr))
+
 static int
 pcap_read_dlpi(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
 {
@@ -498,7 +504,7 @@ pcap_activate_dlpi(pcap_t *p)
 	if (dlinforeq(p->fd, p->errbuf) < 0 ||
 	    dlinfoack(p->fd, (char *)buf, p->errbuf) < 0)
 		goto bad;
-	infop = &((union DL_primitives *)buf)->info_ack;
+	infop = &(MAKE_DL_PRIMITIVES(buf))->info_ack;
 #ifdef HAVE_SOLARIS
 	if (infop->dl_mac_type == DL_IPATM)
 		isatm = 1;
@@ -674,7 +680,7 @@ pcap_activate_dlpi(pcap_t *p)
 	    dlinfoack(p->fd, (char *)buf, p->errbuf) < 0)
 		goto bad;
 
-	infop = &((union DL_primitives *)buf)->info_ack;
+	infop = &(MAKE_DL_PRIMITIVES(buf))->info_ack;
 	if (pcap_process_mactype(p, infop->dl_mac_type) != 0)
 		goto bad;
 
@@ -959,7 +965,7 @@ recv_ack(int fd, int size, const char *what, char *bufp, char *ebuf, int *uerror
 		return (PCAP_ERROR);
 	}
 
-	dlp = (union DL_primitives *) ctl.buf;
+	dlp = MAKE_DL_PRIMITIVES(ctl.buf);
 	switch (dlp->dl_primitive) {
 
 	case DL_INFO_ACK:
@@ -1319,7 +1325,7 @@ dlrawdatareq(int fd, const u_char *datap, int datalen)
 	union DL_primitives *dlp;
 	int dlen;
 
-	dlp = (union DL_primitives*) buf;
+	dlp = MAKE_DL_PRIMITIVES(buf);
 
 	dlp->dl_primitive = DL_HP_RAWDATA_REQ;
 	dlen = DL_HP_RAWDATA_REQ_SIZE;