diff --git a/raw.c b/raw.c
index 5511582..8e22be4 100644
--- a/raw.c
+++ b/raw.c
@@ -286,7 +286,7 @@ static int raw_send(struct transport *t, struct fdarray *fda, int event, int pee
 	/*
 	 * Get the time stamp right away.
 	 */
-	return event ? sk_receive(fd, pkt, len, hwts, MSG_ERRQUEUE) : cnt;
+	return event == TRANS_EVENT ? sk_receive(fd, pkt, len, hwts, MSG_ERRQUEUE) : cnt;
 }
 
 static void raw_release(struct transport *t)
diff --git a/transport.h b/transport.h
index caa07a3..bfdff3d 100644
--- a/transport.h
+++ b/transport.h
@@ -34,6 +34,16 @@ enum transport_type {
 	TRANS_UDS,
 };
 
+/**
+ * Values for the 'event' parameter in transport_send() and
+ * transport_peer().
+ */
+enum transport_event {
+	TRANS_GENERAL,
+	TRANS_EVENT,
+	TRANS_ONESTEP,
+};
+
 enum timestamp_type {
 	TS_SOFTWARE,
 	TS_HARDWARE,
diff --git a/udp.c b/udp.c
index ea92794..e16030d 100644
--- a/udp.c
+++ b/udp.c
@@ -198,7 +198,7 @@ static int udp_send(struct transport *t, struct fdarray *fda, int event, int pee
 	/*
 	 * Get the time stamp right away.
 	 */
-	return event ? sk_receive(fd, junk, len, hwts, MSG_ERRQUEUE) : cnt;
+	return event == TRANS_EVENT ? sk_receive(fd, junk, len, hwts, MSG_ERRQUEUE) : cnt;
 }
 
 static void udp_release(struct transport *t)
diff --git a/udp6.c b/udp6.c
index 9e68574..490a780 100644
--- a/udp6.c
+++ b/udp6.c
@@ -224,7 +224,7 @@ static int udp6_send(struct transport *t, struct fdarray *fda, int event, int pe
 	/*
 	 * Get the time stamp right away.
 	 */
-	return event ? sk_receive(fd, junk, len, hwts, MSG_ERRQUEUE) : cnt;
+	return event == TRANS_EVENT ? sk_receive(fd, junk, len, hwts, MSG_ERRQUEUE) : cnt;
 }
 
 static void udp6_release(struct transport *t)