diff --git a/include/rpl.h b/include/rpl.h
index 34924364..5e0aa04a 100644
--- a/include/rpl.h
+++ b/include/rpl.h
@@ -108,7 +108,9 @@ struct rpl_dio_destprefix {
     u_int8_t rpl_dio_len;
     u_int8_t rpl_dio_prefixlen;        /* in bits */
     u_int8_t rpl_dio_prf;              /* flags, including Route Preference */
-    u_int32_t rpl_dio_prefixlifetime;  /* in seconds */
+    u_int32_t rpl_dio_valid_lifetime; /* in seconds */
+    u_int32_t rpl_dio_preferred_lifetime; /* in seconds */
+    u_int32_t reserved2; /* in seconds */
     u_int8_t rpl_dio_prefix[0];        /* variables number of bytes */
 } PACKED;
 
diff --git a/lib/libndmgmt/dio.cpp b/lib/libndmgmt/dio.cpp
index 982d41b4..13aca996 100644
--- a/lib/libndmgmt/dio.cpp
+++ b/lib/libndmgmt/dio.cpp
@@ -129,13 +129,14 @@ int dag_network::build_prefix_dioopt(ip_subnet prefix)
     struct rpl_dio_destprefix *diodp = (struct rpl_dio_destprefix *)optbuff;
 
     diodp->rpl_dio_prf  = 0x00;
-    diodp->rpl_dio_prefixlifetime = htonl(this->mDio_lifetime);
+    diodp->rpl_dio_valid_lifetime = htonl(this->mDio_lifetime);
+    diodp->rpl_dio_preferred_lifetime = htonl(this->mDio_lifetime);
     diodp->rpl_dio_prefixlen = prefix.maskbits;
     for(int i=0; i < (prefix.maskbits+7)/8; i++) {
         diodp->rpl_dio_prefix[i]=prefix.addr.u.v6.sin6_addr.s6_addr[i];
     }
 
-    this->optlen = ((prefix.maskbits+7)/8 + 1 + 4 + 4);
+    this->optlen = 30;
 
     return this->optlen;
 }