diff --git a/gtp/pdp.h b/gtp/pdp.h
index f1d8ad6..b581952 100644
--- a/gtp/pdp.h
+++ b/gtp/pdp.h
@@ -26,6 +26,7 @@
 #define PDP_EUA_ORG_IETF	0xF1
 #define PDP_EUA_TYPE_v4		0x21
 #define PDP_EUA_TYPE_v6		0x57
+#define PDP_EUA_TYPE_v4v6	0x8D
 
 /* GTP Information elements from 29.060 v3.9.0 7.7 Information Elements */
 /* Also covers version 0. Note that version 0 6: QOS Profile was superceded *
@@ -121,7 +122,7 @@
 	/* Parameters shared by all PDP context belonging to the same MS */
 
 	void *ipif;		/* IP network interface */
-	void *peer;		/* Pointer to peer protocol */
+	void *peer[2];		/* Pointer to peer protocol */
 	void *asap;		/* Application specific service access point */
 
 	uint64_t imsi;		/* International Mobile Subscriber Identity. */