diff --git a/ofproto/ofproto-dpif-xlate.c b/ofproto/ofproto-dpif-xlate.c
index a9d98ee0975..72e0a93c34e 100644
--- a/ofproto/ofproto-dpif-xlate.c
+++ b/ofproto/ofproto-dpif-xlate.c
@@ -4809,7 +4809,7 @@ xlate_actions(struct xlate_in *xin, struct xlate_out *xout)
     }
     is_icmp = is_icmpv4(flow) || is_icmpv6(flow);
 
-    tnl_may_send = tnl_xlate_init(&ctx.base_flow, flow, wc);
+    tnl_may_send = tnl_xlate_init(flow, wc);
 
     ctx.recurse = 0;
     ctx.resubmits = 0;
diff --git a/ofproto/tunnel.c b/ofproto/tunnel.c
index 91c13ab756e..372b38526d8 100644
--- a/ofproto/tunnel.c
+++ b/ofproto/tunnel.c
@@ -333,15 +333,14 @@ tnl_port_receive(const struct flow *flow) OVS_EXCLUDED(rwlock)
 }
 
 static bool
-tnl_ecn_ok(const struct flow *base_flow, struct flow *flow,
-           struct flow_wildcards *wc)
+tnl_ecn_ok(struct flow *flow, struct flow_wildcards *wc)
 {
-    if (is_ip_any(base_flow)) {
+    if (is_ip_any(flow)) {
         if ((flow->tunnel.ip_tos & IP_ECN_MASK) == IP_ECN_CE) {
             if (wc) {
                 wc->masks.nw_tos |= IP_ECN_MASK;
             }
-            if ((base_flow->nw_tos & IP_ECN_MASK) == IP_ECN_NOT_ECT) {
+            if ((flow->nw_tos & IP_ECN_MASK) == IP_ECN_NOT_ECT) {
                 VLOG_WARN_RL(&rl, "dropping tunnel packet marked ECN CE"
                              " but is not ECN capable");
                 return false;
@@ -360,8 +359,7 @@ tnl_ecn_ok(const struct flow *base_flow, struct flow *flow,
  *
  * Returns false if the packet must be dropped. */
 bool
-tnl_xlate_init(const struct flow *base_flow, struct flow *flow,
-               struct flow_wildcards *wc)
+tnl_xlate_init(struct flow *flow, struct flow_wildcards *wc)
 {
     /* tnl_port_should_receive() examines the 'tunnel.ip_dst' field to
      * determine the presence of the tunnel metadata.  However, since tunnels'
@@ -385,7 +383,7 @@ tnl_xlate_init(const struct flow *base_flow, struct flow *flow,
 
             memset(&wc->masks.pkt_mark, 0xff, sizeof wc->masks.pkt_mark);
         }
-        if (!tnl_ecn_ok(base_flow, flow, wc)) {
+        if (!tnl_ecn_ok(flow, wc)) {
             return false;
         }
 
diff --git a/ofproto/tunnel.h b/ofproto/tunnel.h
index b8415abb287..8f9ddabcf35 100644
--- a/ofproto/tunnel.h
+++ b/ofproto/tunnel.h
@@ -38,8 +38,7 @@ int tnl_port_add(const struct ofport_dpif *, const struct netdev *,
 void tnl_port_del(const struct ofport_dpif *);
 
 const struct ofport_dpif *tnl_port_receive(const struct flow *);
-bool tnl_xlate_init(const struct flow *base_flow, struct flow *flow,
-                    struct flow_wildcards *);
+bool tnl_xlate_init(struct flow *, struct flow_wildcards *);
 odp_port_t tnl_port_send(const struct ofport_dpif *, struct flow *,
                          struct flow_wildcards *wc);