diff --git a/epan/dissectors/packet-pppoe.c b/epan/dissectors/packet-pppoe.c
index 22edaa90b0..fe5ca8acfb 100644
--- a/epan/dissectors/packet-pppoe.c
+++ b/epan/dissectors/packet-pppoe.c
@@ -1289,6 +1289,7 @@ void proto_reg_handoff_pppoes(void)
 	dissector_handle_t pppoes_handle  =
 	    create_dissector_handle(dissect_pppoes, proto_pppoes);
 	dissector_add_uint("ethertype", ETHERTYPE_PPPOES, pppoes_handle);
+	dissector_add_uint("wtap_encap", WTAP_ENCAP_PPP_ETHER, pppoes_handle);
 
 	/* Get a handle for the PPP dissector */
 	ppp_handle = find_dissector("ppp");
diff --git a/wiretap/pcap-common.c b/wiretap/pcap-common.c
index 576e5d82d4..da08af1ae3 100644
--- a/wiretap/pcap-common.c
+++ b/wiretap/pcap-common.c
@@ -158,6 +158,11 @@ static const struct {
 	 */
 	{ 50,		WTAP_ENCAP_PPP },
 
+	/*
+	 * Used by NetBSD and OpenBSD pppoe(4).
+	 */
+	{ 51,		WTAP_ENCAP_PPP_ETHER },
+
 	/*
 	 * Apparently used by the Axent Raptor firewall (now Symantec
 	 * Enterprise Firewall).
diff --git a/wiretap/wtap.c b/wiretap/wtap.c
index 81c2a668fd..3def7c5c47 100644
--- a/wiretap/wtap.c
+++ b/wiretap/wtap.c
@@ -555,7 +555,10 @@ static struct encap_type_info encap_table_base[] = {
 	{ "IP over Infiniband", "ip-over-ib" },
 
 	/* WTAP_ENCAP_MPEG_2_TS */
-	{ "ISO/IEC 13818-1 MPEG2-TS", "mp2ts" }
+	{ "ISO/IEC 13818-1 MPEG2-TS", "mp2ts" },
+
+	/* WTAP_ENCAP_PPP_ETHER */
+	{ "PPP-over-Ethernet session", "pppoes" }
 };
 
 gint wtap_num_encap_types = sizeof(encap_table_base) / sizeof(struct encap_type_info);
diff --git a/wiretap/wtap.h b/wiretap/wtap.h
index 798bcae2d7..1dbbe13972 100644
--- a/wiretap/wtap.h
+++ b/wiretap/wtap.h
@@ -228,6 +228,7 @@ extern "C" {
 #define WTAP_ENCAP_NETANALYZER_TRANSPARENT      136
 #define WTAP_ENCAP_IP_OVER_IB                   137
 #define WTAP_ENCAP_MPEG_2_TS			138
+#define WTAP_ENCAP_PPP_ETHER			139
 
 #define WTAP_NUM_ENCAP_TYPES                    wtap_get_num_encap_types()