diff --git a/src/shrpx_downstream.cc b/src/shrpx_downstream.cc
index 8c02b340..62a30d7f 100644
--- a/src/shrpx_downstream.cc
+++ b/src/shrpx_downstream.cc
@@ -135,7 +135,7 @@ Downstream::Downstream(Upstream *upstream, MemchunkPool *mcpool,
       affinity_cookie_(0),
       request_state_(DownstreamState::INITIAL),
       response_state_(DownstreamState::INITIAL),
-      dispatch_state_(DISPATCH_NONE),
+      dispatch_state_(DispatchState::NONE),
       upgraded_(false),
       chunked_request_(false),
       chunked_response_(false),
@@ -1067,9 +1067,9 @@ bool Downstream::request_submission_ready() const {
          response_state_ == DownstreamState::INITIAL;
 }
 
-int Downstream::get_dispatch_state() const { return dispatch_state_; }
+DispatchState Downstream::get_dispatch_state() const { return dispatch_state_; }
 
-void Downstream::set_dispatch_state(int s) { dispatch_state_ = s; }
+void Downstream::set_dispatch_state(DispatchState s) { dispatch_state_ = s; }
 
 void Downstream::attach_blocked_link(BlockedLink *l) {
   assert(!blocked_link_);
diff --git a/src/shrpx_downstream.h b/src/shrpx_downstream.h
index ce137547..9f629c92 100644
--- a/src/shrpx_downstream.h
+++ b/src/shrpx_downstream.h
@@ -292,6 +292,14 @@ enum class DownstreamState {
   HTTP1_REQUEST_HEADER_TOO_LARGE,
 };
 
+enum class DispatchState {
+  NONE,
+  PENDING,
+  BLOCKED,
+  ACTIVE,
+  FAILURE,
+};
+
 class Downstream {
 public:
   Downstream(Upstream *upstream, MemchunkPool *mcpool, int32_t stream_id);
@@ -448,8 +456,8 @@ public:
   // true if retry attempt should not be done.
   bool no_more_retry() const;
 
-  int get_dispatch_state() const;
-  void set_dispatch_state(int s);
+  DispatchState get_dispatch_state() const;
+  void set_dispatch_state(DispatchState s);
 
   void attach_blocked_link(BlockedLink *l);
   BlockedLink *detach_blocked_link();
@@ -490,14 +498,6 @@ public:
     EVENT_TIMEOUT = 0x2,
   };
 
-  enum {
-    DISPATCH_NONE,
-    DISPATCH_PENDING,
-    DISPATCH_BLOCKED,
-    DISPATCH_ACTIVE,
-    DISPATCH_FAILURE,
-  };
-
   Downstream *dlnext, *dlprev;
 
   // the length of response body sent to upstream client
@@ -561,7 +561,7 @@ private:
   // response state
   DownstreamState response_state_;
   // only used by HTTP/2 upstream
-  int dispatch_state_;
+  DispatchState dispatch_state_;
   // true if the connection is upgraded (HTTP Upgrade or CONNECT),
   // excluding upgrade to HTTP/2.
   bool upgraded_;
diff --git a/src/shrpx_downstream_queue.cc b/src/shrpx_downstream_queue.cc
index 74465396..f8906e8e 100644
--- a/src/shrpx_downstream_queue.cc
+++ b/src/shrpx_downstream_queue.cc
@@ -49,12 +49,12 @@ DownstreamQueue::~DownstreamQueue() {
 }
 
 void DownstreamQueue::add_pending(std::unique_ptr<Downstream> downstream) {
-  downstream->set_dispatch_state(Downstream::DISPATCH_PENDING);
+  downstream->set_dispatch_state(DispatchState::PENDING);
   downstreams_.append(downstream.release());
 }
 
 void DownstreamQueue::mark_failure(Downstream *downstream) {
-  downstream->set_dispatch_state(Downstream::DISPATCH_FAILURE);
+  downstream->set_dispatch_state(DispatchState::FAILURE);
 }
 
 DownstreamQueue::HostEntry &
@@ -87,13 +87,13 @@ void DownstreamQueue::mark_active(Downstream *downstream) {
   auto &ent = find_host_entry(make_host_key(downstream));
   ++ent.num_active;
 
-  downstream->set_dispatch_state(Downstream::DISPATCH_ACTIVE);
+  downstream->set_dispatch_state(DispatchState::ACTIVE);
 }
 
 void DownstreamQueue::mark_blocked(Downstream *downstream) {
   auto &ent = find_host_entry(make_host_key(downstream));
 
-  downstream->set_dispatch_state(Downstream::DISPATCH_BLOCKED);
+  downstream->set_dispatch_state(DispatchState::BLOCKED);
 
   auto link = new BlockedLink{};
   downstream->attach_blocked_link(link);
@@ -131,7 +131,7 @@ Downstream *DownstreamQueue::remove_and_get_blocked(Downstream *downstream,
   auto host = make_host_key(downstream);
   auto &ent = find_host_entry(host);
 
-  if (downstream->get_dispatch_state() == Downstream::DISPATCH_ACTIVE) {
+  if (downstream->get_dispatch_state() == DispatchState::ACTIVE) {
     --ent.num_active;
   } else {
     // For those downstreams deleted while in blocked state
diff --git a/src/shrpx_downstream_queue.h b/src/shrpx_downstream_queue.h
index 1a750343..a9afc084 100644
--- a/src/shrpx_downstream_queue.h
+++ b/src/shrpx_downstream_queue.h
@@ -88,10 +88,10 @@ public:
   // |host|.
   bool can_activate(const StringRef &host) const;
   // Removes and frees |downstream| object.  If |downstream| is in
-  // Downstream::DISPATCH_ACTIVE, and |next_blocked| is true, this
-  // function may return Downstream object with the same target host
-  // in Downstream::DISPATCH_BLOCKED if its connection is now not
-  // blocked by conn_max_per_host_ limit.
+  // DispatchState::ACTIVE, and |next_blocked| is true, this function
+  // may return Downstream object with the same target host in
+  // DispatchState::BLOCKED if its connection is now not blocked by
+  // conn_max_per_host_ limit.
   Downstream *remove_and_get_blocked(Downstream *downstream,
                                      bool next_blocked = true);
   Downstream *get_downstreams() const;
diff --git a/src/shrpx_http2_upstream.cc b/src/shrpx_http2_upstream.cc
index 7762b147..94ff99a5 100644
--- a/src/shrpx_http2_upstream.cc
+++ b/src/shrpx_http2_upstream.cc
@@ -2025,7 +2025,7 @@ int Http2Upstream::on_timeout(Downstream *downstream) {
 
 void Http2Upstream::on_handler_delete() {
   for (auto d = downstream_queue_.get_downstreams(); d; d = d->dlnext) {
-    if (d->get_dispatch_state() == Downstream::DISPATCH_ACTIVE &&
+    if (d->get_dispatch_state() == DispatchState::ACTIVE &&
         d->accesslog_ready()) {
       handler_->write_accesslog(d);
     }
@@ -2035,10 +2035,10 @@ void Http2Upstream::on_handler_delete() {
 int Http2Upstream::on_downstream_reset(Downstream *downstream, bool no_retry) {
   int rv;
 
-  if (downstream->get_dispatch_state() != Downstream::DISPATCH_ACTIVE) {
+  if (downstream->get_dispatch_state() != DispatchState::ACTIVE) {
     // This is error condition when we failed push_request_headers()
     // in initiate_downstream().  Otherwise, we have
-    // Downstream::DISPATCH_ACTIVE state, or we did not set
+    // DispatchState::ACTIVE state, or we did not set
     // DownstreamConnection.
     downstream->pop_downstream_connection();
     handler_->signal_write();