diff --git a/raw.c b/raw.c
index 15c9756..0bd15b0 100644
--- a/raw.c
+++ b/raw.c
@@ -279,7 +279,7 @@ static int raw_recv(struct transport *t, int fd, void *buf, int buflen,
 	buflen += hlen;
 	hdr = (struct eth_hdr *) ptr;
 
-	cnt = sk_receive(fd, ptr, buflen, addr, hwts, 0);
+	cnt = sk_receive(fd, ptr, buflen, addr, hwts, MSG_DONTWAIT);
 
 	if (cnt >= 0)
 		cnt -= hlen;
diff --git a/udp.c b/udp.c
index 36802fb..826bd12 100644
--- a/udp.c
+++ b/udp.c
@@ -210,7 +210,7 @@ no_event:
 static int udp_recv(struct transport *t, int fd, void *buf, int buflen,
 		    struct address *addr, struct hw_timestamp *hwts)
 {
-	return sk_receive(fd, buf, buflen, addr, hwts, 0);
+	return sk_receive(fd, buf, buflen, addr, hwts, MSG_DONTWAIT);
 }
 
 static int udp_send(struct transport *t, struct fdarray *fda,
diff --git a/udp6.c b/udp6.c
index 744a5bc..ba5482e 100644
--- a/udp6.c
+++ b/udp6.c
@@ -227,7 +227,7 @@ no_event:
 static int udp6_recv(struct transport *t, int fd, void *buf, int buflen,
 		     struct address *addr, struct hw_timestamp *hwts)
 {
-	return sk_receive(fd, buf, buflen, addr, hwts, 0);
+	return sk_receive(fd, buf, buflen, addr, hwts, MSG_DONTWAIT);
 }
 
 static int udp6_send(struct transport *t, struct fdarray *fda,